Chapter 4 Quiz 2 (2nd Secondary Biology)
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In which of the following plants, there will be no transpiration?
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Plants living in deserts
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Aquatic submerged plants
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Plants growing in hilly regions
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Aquatic plants with floating leaves
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This Chapter 4 Quiz 2 for 2nd Secondary Biology covers key topics in plant physiology, including water transport, transpiration, and gas exchange. Students will assess their understanding of how environmental factors affect plant processes and the implications for photosynthesis.
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- 2.
Transpiration is very important for plants because it helps in …..
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The movement of water and minerals absorbed by roots to various parts of the plant
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The absorption of water from soil
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The cooling of leaves at high temperature
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All of them
Correct Answer
A. All of themExplanation
Transpiration is the process by which water is lost from the leaves of plants in the form of water vapor. It plays a crucial role in the movement of water and minerals absorbed by the roots to different parts of the plant. This is because transpiration creates a pull or suction force, known as the transpirational pull, which helps in the upward movement of water and nutrients through the xylem vessels. Additionally, transpiration also aids in the absorption of water from the soil as it creates a gradient for water movement. Lastly, transpiration helps in the cooling of leaves at high temperatures by evaporating water from the leaf surface, which helps regulate the plant's temperature. Therefore, all of the given options are correct.Rate this question:
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- 3.
Name the specialized pores from where guttation takes place.
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Stomata
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Hydathodes
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Guard cell
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Lenticels
Correct Answer
A. HydathodesExplanation
Hydathodes are specialized pores found in the leaves of plants, particularly in the margins or tips of leaves. They are responsible for guttation, which is the process of exuding water droplets from the leaf surface. Unlike stomata, which primarily regulate gas exchange, hydathodes specifically release excess water from the plant. Guard cells are responsible for opening and closing stomata, while lenticels are small openings in the bark of woody plants for gas exchange. Therefore, the correct answer is hydathodes.Rate this question:
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- 4.
One of the following statements describes guttation .....
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When a plant dies from lack of photosynthesis
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When a plant wilts from lack of water
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When a plant is flooded with water and drowns
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When a plant pushes excess water out
Correct Answer
A. When a plant pushes excess water outExplanation
Guttation is a process in which plants release excess water through specialized structures called hydathodes. This typically occurs when the soil is moist and the plant's roots absorb more water than it needs for photosynthesis and other metabolic processes. The excess water is forced out of the plant through hydathodes located on the edges of leaves or tips of grass blades. This process helps maintain the water balance within the plant and prevents the accumulation of too much water, which can be detrimental to its growth and survival.Rate this question:
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- 5.
Each of the following plants has/have stomata, cuticle and lenticels except .....
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Cherry trees
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Herbaceous plants
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Apples
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Potatoes
Correct Answer
A. Herbaceous plantsExplanation
Herbaceous plants are the only option among the given plants that do not have stomata, cuticle, and lenticels. Stomata are tiny openings on the surface of leaves that allow for gas exchange, while cuticle is a waxy layer that covers the leaves and helps reduce water loss. Lenticels, on the other hand, are small openings on the stems of woody plants that allow for gas exchange. Cherry trees, apples, and potatoes all have stomata, cuticle, and lenticels, making herbaceous plants the correct answer.Rate this question:
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- 6.
In the experiment shown in the figure below to demonstrate transpiration, what happens if we set another experiment exactly in the same way except that the pot should be without any plant?
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No drops will appear inside the wall of the bell jar.
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Drops will appear on the surface of the rubber sheath from outside.
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Drops will appear inside the wall of the bell jar in a greater amount.
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The bell jar gets hot.
Correct Answer
A. No drops will appear inside the wall of the bell jar.Explanation
If we set another experiment exactly in the same way except that the pot should be without any plant, no drops will appear inside the wall of the bell jar. This is because transpiration, which is the process of water movement through a plant and its evaporation from aerial parts, occurs through the stomata on the leaves. Without a plant, there will be no transpiration and therefore no water vapor to condense and form drops inside the bell jar.Rate this question:
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- 7.
From the factors which oppose transpiration in plants ……
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Thicker cuticle layer
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Wideness of the stomata
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Wideness of the leaf exposed surface
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Increase in the number of stomata
Correct Answer
A. Thicker cuticle layerExplanation
A thicker cuticle layer on the surface of the leaf would reduce the rate of transpiration in plants. The cuticle is a waxy layer that covers the epidermis of the leaf and acts as a barrier to water loss. By having a thicker cuticle, less water would be able to evaporate from the leaf surface, thus reducing the overall rate of transpiration.Rate this question:
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- 8.
The following are some features of some plants
- They lose a lot of water through transpiration
- Their leaves are always broad and flat
- They lose very little water through transpiration
- Their roots grow very deep into the soil
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(1) and (2)
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(2) and (4)
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(2) and (3)
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(3) and (4)
Correct Answer
A. (3) and (4)Explanation
Desert plants typically have adaptations that allow them to conserve water in their arid environment. They have specialized leaves that are small and often needle-like, reducing the surface area for transpiration and minimizing water loss. Additionally, desert plants have deep root systems that enable them to access water sources deep underground. Therefore, the combination of losing very little water through transpiration (3) and having roots that grow very deep into the soil (4) is typical of desert plants.Rate this question:
- 9.
In the experiment shown below, if you cut a transverse section of the stem with a razor and place it on a slide then study it under the microscope. What is your observation? It is observed that .......
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Only xylem has taken the stain.
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Only phloem has taken the stain.
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Both xylem and phloem have taken the stain.
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Only cambium layer has taken the stain.
Correct Answer
A. Only xylem has taken the stain.Explanation
When a transverse section of the stem is cut and placed on a slide, and then observed under a microscope, it is observed that only the xylem has taken the stain. This suggests that the xylem tissue has a higher affinity for the stain compared to the other tissues present in the stem section. The xylem tissue is responsible for the transport of water and minerals from the roots to the rest of the plant, and its staining indicates its presence and functionality in the stem.Rate this question:
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- 10.
Which of the following is an important function of stomata in a leaf?
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Absorbing water vapour from the air
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Allowing gaseous waste products to leave the plant
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Producing chlorophyll for photosynthesis
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Getting rid of insoluble wastes
Correct Answer
A. Allowing gaseous waste products to leave the plantExplanation
Stomata are small openings on the surface of leaves that allow for gas exchange. They play a crucial role in regulating the entry and exit of gases, such as oxygen and carbon dioxide, in plants. By allowing gaseous waste products, such as oxygen, to leave the plant, stomata help maintain proper gas balance and prevent the buildup of harmful gases. This function is essential for the survival of plants, as it ensures the removal of waste products produced during cellular respiration and photosynthesis.Rate this question:
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- 11.
In the graph shown below, at which point the water concentration is greater outside the leaf?
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B
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A
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D
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C
Correct Answer
A. DExplanation
In the given graph, point D represents the water concentration outside the leaf. This can be determined by observing that point D is located above the line representing the water concentration inside the leaf. Since water concentration always moves from an area of higher concentration to an area of lower concentration, point D indicates that the water concentration is greater outside the leaf.Rate this question:
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- 12.
Which graph illustrates a factor opposing the increase of transpiration rate?
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R
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S
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Q
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T
Correct Answer
A. SExplanation
Graph S illustrates a factor opposing the increase of transpiration rate. This can be inferred because the transpiration rate is decreasing over time in graph S. This indicates that there is a factor present that is inhibiting or opposing the process of transpiration.Rate this question:
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- 13.
Which of the following is not a reason for why is the rate of transpiration increases by increasing light intensity?
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Absorption of light by green leaves results in an increased temperature of the leaves, which eventually causes increased vapor pressure of water within the leaves and an increased water loss.
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Light increases the rate of water absorption and the resulting increased turgidity of the two guard cells, which form the boundary of each stoma.
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Light speeds up transpiration by decreasing water vapour surrounding the plant.
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Increased light intensity will increase the rate of photosynthesis so more water is drawn into the leaves where photosynthesis primarily takes place.
Correct Answer
A. Light speeds up transpiration by decreasing water vapour surrounding the plant.Explanation
Increasing light intensity does not decrease water vapor surrounding the plant. In fact, increasing light intensity can increase the rate of transpiration by increasing the temperature of the leaves and thus increasing the vapor pressure of water within the leaves. This increased vapor pressure leads to an increased water loss through transpiration.Rate this question:
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- 14.
The following figure is for an experiment to measure the rate of transpiration in two branches of a certain plant. Which reading of the spring balance is the correct one after three days of the experiment?
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A
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B
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C
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D
Correct Answer
A. C -
- 15.
The following table illustrates some properties of four different plants (A), (B), (C) and (D) having same environmental conditions. Which of these plants loses the highest amount of water?
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B
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A
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D
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C
Correct Answer
A. CExplanation
Plant C loses the highest amount of water because it is the only plant in the table that is not shaded. Shading helps to reduce water loss through transpiration, so the shaded plants (A, B, and D) would lose less water compared to plant C.Rate this question:
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- 16.
Guttation is mainly due to.....
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Root pressure
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Transpiration pull
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Imbibition
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Capillarity
Correct Answer
A. Root pressureExplanation
Guttation is the process by which water droplets are released from the tips of leaves. It occurs when root pressure forces water up from the roots and into the plant's xylem vessels. This pressure is created by the active transport of mineral ions into the root cells, which increases the solute concentration and causes water to move in by osmosis. As a result, the excess water is forced out of the leaf tips through specialized structures called hydathodes. Therefore, guttation is mainly due to root pressure.Rate this question:
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- 17.
Plant seedlings were put in four tubes; each contains 200 C.C water, for two days under same environmental conditions as shown in figure below. Which seedling its leaves were covered with paraffin wax?
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A
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B
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C
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D
Correct Answer
A. AExplanation
Based on the information provided, the seedling with its leaves covered in paraffin wax is seedling A.Rate this question:
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- 18.
Which of the following plants has the highest transpiration rate?
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Elodea
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Cactus
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Bean
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Barbary Fig
Correct Answer
A. BeanExplanation
Bean plants have a higher transpiration rate compared to the other plants listed because they have more stomata on their leaves, which allows for more water to evaporate. Additionally, bean plants typically have a larger leaf surface area, further increasing their transpiration rate.Rate this question:
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- 19.
Which of the following is a factor that causes the exit of CO2 from stomata of plant leaves?
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Increasing photosynthesis rate
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Increasing CO2 diffusion
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Decreasing carbohydrate catabolism
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The great transferring of CO2 from the phloem to the mesophyll
Correct Answer
A. Increasing CO2 diffusionExplanation
Increasing CO2 diffusion is a factor that causes the exit of CO2 from stomata of plant leaves. Stomata are small openings on the surface of plant leaves that allow for gas exchange, including the release of CO2. When the concentration of CO2 inside the leaf increases, it creates a concentration gradient that drives the diffusion of CO2 out of the leaf through the stomata. Therefore, increasing the rate of CO2 diffusion will result in more CO2 exiting the stomata.Rate this question:
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- 20.
What happens to the process shown in the figure below if the plant is put in a low-pressure area?
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Increases
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Decreases
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Stops completely
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Is not affected
Correct Answer
A. IncreasesExplanation
If the plant is put in a low-pressure area, the process shown in the figure will increase. This is because in a low-pressure area, the pressure surrounding the plant is lower than the pressure inside the plant. As a result, the plant will take in more water and nutrients from the soil through its roots, and this increased uptake will lead to an overall increase in the process.Rate this question:
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- 21.
Which of the following processes involves the excretion of some metabolic waste products in plants?
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Transpiration
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Respiration
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Photosynthesis
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All the answers are correct.
Correct Answer
A. All the answers are correct.Explanation
All the given options involve the excretion of some metabolic waste products in plants. Transpiration is the process of water loss from plants, which also helps in the removal of waste products. Respiration in plants involves the breakdown of glucose and release of carbon dioxide as a waste product. Photosynthesis, while not directly involved in excretion, does produce oxygen as a byproduct, which can be considered a waste product for the plant. Therefore, all the options listed involve the excretion of some metabolic waste products in plants.Rate this question:
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- 22.
Plants, like most living organisms, respire. Water is a waste product of respiration. How can this water be reused by plants?
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As a source of energy for metabolic processes
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As a source of nitrogen for the synthesis of nitrogenous compounds
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As a reactant in photosynthesis
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As an insulating gas to regulate temperature
Correct Answer
A. As a reactant in photosynthesisExplanation
Plants can reuse the water produced during respiration as a reactant in photosynthesis. During photosynthesis, plants use water, along with carbon dioxide and sunlight, to produce glucose and oxygen. The water molecules are broken down, and the oxygen is released as a waste product, while the hydrogen atoms are used to build glucose molecules. Therefore, the water produced during respiration can be recycled and used in the process of photosynthesis to produce energy and glucose for the plant's growth and development.Rate this question:
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- 23.
Oxygen is a product of photosynthesis. How can this oxygen be reused by plants?
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As a reactant in the synthesis of new proteins
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As a reactant in translocation
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As a reactant in aerobic respiration
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As a source of nutrients
Correct Answer
A. As a reactant in aerobic respirationExplanation
Plants can reuse the oxygen produced during photosynthesis as a reactant in aerobic respiration. During respiration, plants break down glucose and other organic molecules to release energy, and oxygen is required for this process. The oxygen is used to oxidize the organic molecules, releasing carbon dioxide and water as byproducts. This process allows plants to obtain energy for growth and other metabolic activities.Rate this question:
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- 24.
Plants, like most living organisms, respire. Carbon dioxide is a waste product of respiration. How can this carbon dioxide be reused by the plant?
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As an insulating gas to regulate temperature
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As a reactant in photosynthesis
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As a reactant in transpiration
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As a source of nitrogen for the synthesis of nitrogenous compounds
Correct Answer
A. As a reactant in photosynthesisExplanation
During photosynthesis, plants use carbon dioxide as a reactant to produce glucose and oxygen. This process occurs in the chloroplasts of plant cells, where sunlight is converted into chemical energy. The carbon dioxide is broken down and its carbon atoms are used to build glucose molecules, while the oxygen is released as a byproduct. Therefore, the carbon dioxide produced during respiration can be reused by the plant as a reactant in photosynthesis to produce energy-rich molecules for growth and development.Rate this question:
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- 25.
The rate of transpiration in plants is affected by various environmental factors. In a farming field, which of the following could negatively impact transpiration?
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Water shortages
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Loss of the energy powering the irrigation system
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Droughts
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All of the answers are correct.
Correct Answer
A. All of the answers are correct.Explanation
All of the given options could negatively impact transpiration in plants. Water shortages can directly affect the availability of water for transpiration. Loss of energy powering the irrigation system can lead to a lack of water supply, which in turn can affect transpiration. Droughts, by definition, result in a scarcity of water, which can significantly reduce transpiration rates. Therefore, all of the answers are correct as they can all have a negative impact on transpiration in plants.Rate this question:
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- 26.
The following diagram outlines the basic steps of the upward movement of water through the main parts (root, stem, and leaf) of a very tall conifer tree.Which of the following does label (X) in the diagram refer to?
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Osmosis
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Guttation
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Root pressure
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Cohesion and adhesion
Correct Answer
A. OsmosisExplanation
The correct answer is osmosis. Osmosis is the process by which water moves from an area of lower solute concentration to an area of higher solute concentration through a semi-permeable membrane. In the context of the diagram, label (X) likely refers to the movement of water through the plant's cells via osmosis, as water moves from the roots to the stem and leaves.Rate this question:
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- 27.
Which of the following is not a limiting factor for transpiration?
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Light intensity
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Humidity
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CO2 concentration
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Wind
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Temperature
Correct Answer
A. CO2 concentrationExplanation
CO2 concentration is not a limiting factor for transpiration because transpiration is the process by which water is lost from plants through stomata in the leaves. It is primarily driven by factors such as light intensity, humidity, wind, and temperature. CO2 concentration, on the other hand, is important for photosynthesis, but it does not directly affect the rate of transpiration.Rate this question:
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- 28.
How is water mainly lost from the leaves of a plant?
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It diffuses out of the spongy mesophyll.
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It evaporates through the waxy cuticle.
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It evaporates from the stomata.
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It moves back to the roots by osmosis.
Correct Answer
A. It evaporates from the stomata.Explanation
Water is mainly lost from the leaves of a plant through evaporation from the stomata. Stomata are small openings on the surface of leaves that allow for gas exchange, including the release of water vapor. As the water vaporizes, it escapes through these openings, resulting in water loss from the leaves. The other options mentioned, such as diffusion out of the spongy mesophyll and evaporation through the waxy cuticle, are not the main mechanisms of water loss from the leaves.Rate this question:
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- 29.
How does the plant encounter the hot environmental conditions?
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Decreasing photosynthesis process
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Increasing transpiration process
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Decreases water absorption
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Increases water reabsorption
Correct Answer
A. Increasing transpiration processExplanation
When plants encounter hot environmental conditions, they increase their transpiration process. Transpiration is the process by which water is lost from the plant through the stomata in the leaves. This helps to cool the plant down as the water evaporates from the leaves. By increasing transpiration, the plant is able to release excess heat and maintain its temperature within a suitable range for survival. Decreasing photosynthesis process, decreasing water absorption, and increasing water reabsorption would not directly help the plant to cope with hot environmental conditions.Rate this question:
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- 30.
What is the result of planting Tomato plant in a high moisture soil?
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Decreasing of guttation rate
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Increasing of transpiration rate
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Increasing the excretory rate of nitrogenous wastes
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Decreasing of photosynthesis rate
Correct Answer
A. Increasing of transpiration rateExplanation
When a tomato plant is planted in a high moisture soil, it will increase its transpiration rate. Transpiration is the process by which plants lose water through their leaves. In high moisture soil, there is an abundance of water available for the plant to absorb through its roots. This excess water causes the plant to increase its transpiration rate in order to maintain a balance of water and nutrients within its cells. Therefore, the correct answer is increasing of transpiration rate.Rate this question:
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- 31.
What is the factor that causes the exit of CO2 from plant leaves stomata?
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Increasing its diffusion rate through a network of air spaces within the plant
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Increasing the photosynthesis rate
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Decreasing the carbohydrates catabolism
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Its transferring greatly from the phloem to the mesophyll of the leaf
Correct Answer
A. Increasing its diffusion rate through a network of air spaces within the plantExplanation
Increasing the diffusion rate of CO2 through a network of air spaces within the plant is the factor that causes the exit of CO2 from plant leaves stomata. The network of air spaces within the plant allows for increased surface area for gas exchange, facilitating the diffusion of CO2 out of the leaf. This process is essential for plants to obtain the necessary carbon dioxide for photosynthesis and to release the byproduct, oxygen, into the atmosphere.Rate this question:
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- 32.
What is the result of cultivating a plant in a Liming soil?
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Increase in the transpiration rate
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Increase in the rate of photosynthesis
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Increase in Nitrogenous wastes excretion
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Increase in the rate at which leaves fall
Correct Answer
A. Increase in the rate at which leaves fallExplanation
Cultivating a plant in a Liming soil increases the rate at which leaves fall. Liming soil refers to the process of adding lime to soil to reduce acidity. This can lead to an increase in the breakdown of organic matter in the soil, resulting in a higher rate of leaf decomposition. As a result, leaves may fall from the plant at a faster rate.Rate this question:
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- 33.
The following diagram represents a T.S in a young dicot leaf. Which structure helps in the ascent of water inside the xylem vessels?
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(1)
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(2)
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(3)
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(4)
Correct Answer
A. (2)Explanation
The diagram is not provided, so it is not possible to give a specific explanation for the correct answer. However, in general, the structure that helps in the ascent of water inside the xylem vessels in a dicot leaf is the transpiration pull. Transpiration, the loss of water vapor through the stomata, creates a negative pressure gradient that pulls water up from the roots through the xylem vessels. This process is aided by the cohesion and adhesion properties of water molecules, which allow them to stick together and to the walls of the xylem vessels, facilitating the upward movement of water.Rate this question:
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- 34.
Which one of following will not directly affect transpiration?
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Wind speed
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Chlorophyll content of leaves
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Light
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Temperature
Correct Answer
A. Chlorophyll content of leavesExplanation
Chlorophyll content of leaves will not directly affect transpiration because transpiration is the process by which water is lost from the leaves through stomata. It is primarily influenced by factors such as wind speed, light, and temperature. Chlorophyll content, on the other hand, is related to the green pigment in plants that is responsible for photosynthesis, but it does not directly impact the transpiration process.Rate this question:
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- 35.
Pure water can be lost from a plant through all of the following structures except ...
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The stomata
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The hydathodes
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The woody stem
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The waxy layer which covers leaves
Correct Answer
A. The hydathodesExplanation
Hydathodes are specialized structures in plants that release excess water in the form of droplets. This process is known as guttation. Therefore, it is incorrect to say that pure water can be lost from a plant through hydathodes. On the other hand, stomata are small openings in the leaves that allow for gas exchange and water vapor to escape through transpiration. The woody stem does not play a direct role in water loss, but the waxy layer on leaves helps to reduce water loss by preventing excessive evaporation.Rate this question:
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- 36.
Which of the following is not a possible way where water can be lost through a plant’s leaves?
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Cuticular transpiration
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Lenticular transpiration
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Guttation
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Stomatal transpiration
Correct Answer
A. Lenticular transpirationExplanation
Lenticular transpiration is not a possible way where water can be lost through a plant's leaves. Cuticular transpiration occurs through the cuticle, which is the waxy layer covering the leaf surface. Guttation is the exudation of water droplets from the tips of leaves or stems. Stomatal transpiration happens through the stomata, which are small openings on the leaf surface. However, lenticular transpiration refers to water loss through lenticels, which are small openings in the bark of woody stems. Since the question asks for a way where water can be lost through a plant's leaves, lenticular transpiration is not a relevant option.Rate this question:
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- 37.
Which of the following tables best differentiates between transpiration and guttation?
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A
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B
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C
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D
Correct Answer
A. BExplanation
Table B best differentiates between transpiration and guttation because it clearly outlines the main differences between the two processes. It states that transpiration occurs through stomata on leaves, while guttation occurs through hydathodes on leaf margins. Additionally, it mentions that transpiration is a continuous process that helps in cooling the plant, while guttation is intermittent and helps in removing excess water. This table provides a clear and concise comparison between transpiration and guttation.Rate this question:
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- 38.
Which of the following is the similarity between lenticular transpiration and guttation?
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Time of occurrence
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Product substances
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Getting rid of water
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Site of occurrence
Correct Answer
A. Getting rid of waterExplanation
Lenticular transpiration and guttation both involve the process of getting rid of water. Lenticular transpiration is the loss of water vapor through small openings called lenticels on the stems and branches of plants, while guttation is the exudation of water droplets from the tips or edges of leaves. In both cases, the plants are getting rid of excess water.Rate this question:
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- 39.
The figure below illustrates the percentage of water loss through transpiration in a certain plant. Which of the following plant parts is represented by the shaded area?
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Lower epidermis of the leaf
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Woody stem
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Upper epidermis of the leaf
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Green stem
Correct Answer
A. Woody stemExplanation
The shaded area in the figure represents the woody stem. This is because transpiration, which is the loss of water through the plant, primarily occurs through the stomata on the leaves. The lower epidermis of the leaf and upper epidermis of the leaf do not have significant transpiration rates compared to the stomata. The green stem may have some transpiration, but it is not as significant as the woody stem. Therefore, the woody stem is the most likely plant part represented by the shaded area.Rate this question:
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- 40.
Which of the following is not a function of the structure (3)?
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Getting rid of salts
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Exchange of gases
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Lowering the degree of temperature
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Getting rid of water
Correct Answer
A. Getting rid of saltsExplanation
The structure (3) does not function to get rid of salts.Rate this question:
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- 41.
Which of the following substances the plant gets rid of it in abundance during day time?
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Carbon dioxide
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Water
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Mineral salts
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Nitrogenous wastes
Correct Answer
A. WaterExplanation
During photosynthesis, plants take in carbon dioxide and release oxygen. However, they also release water vapor through a process called transpiration. This occurs during the day when the plant's stomata are open to allow for gas exchange. Therefore, the plant gets rid of water in abundance during daytime.Rate this question:
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- 42.
Wilting occurs due to excessive .......
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Guttation
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Absorption
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Transpiration
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Photosynthesis
Correct Answer
A. TranspirationExplanation
Wilting occurs due to excessive transpiration. Transpiration is the process by which plants lose water from their leaves through small openings called stomata. When there is excessive transpiration, the rate of water loss from the leaves is higher than the rate at which water is absorbed by the roots. This leads to a water deficit in the plant, causing the cells to lose turgidity and the plant to wilt.Rate this question:
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- 43.
Which is untrue for excretion process in plants?
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Terrestrial plants excrete some waste into the soil around them.
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Aquatic plants excrete metabolic wastes through diffusion.
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The rate of catabolism of some Cotton plants weighing 50 kilograms is nearly equal to that of a Sheep having a weight of 50 kilograms too.
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Plants transform some nitrogen compounds into useful substances.
Correct Answer
A. The rate of catabolism of some Cotton plants weighing 50 kilograms is nearly equal to that of a Sheep having a weight of 50 kilograms too.Explanation
The statement that the rate of catabolism of some Cotton plants weighing 50 kilograms is nearly equal to that of a Sheep having a weight of 50 kilograms is untrue for the excretion process in plants. This is because catabolism refers to the breakdown of complex molecules into simpler ones, which is not directly related to excretion. The rate of catabolism in plants and animals can vary significantly due to differences in metabolic processes and physiological characteristics. Therefore, comparing the catabolism rate of cotton plants to that of a sheep is not accurate in the context of excretion.Rate this question:
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- 44.
Which of the following doesn’t exit out through stomata?
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Oxygen
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Carbon dioxide
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Pure water
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Mineral salts
Correct Answer
A. Mineral saltsExplanation
Mineral salts do not exit out through stomata. Stomata are small openings on the surface of leaves that allow for the exchange of gases, such as oxygen and carbon dioxide, as well as the release of water vapor during transpiration. However, mineral salts are absorbed by the roots of plants and transported through the xylem to the rest of the plant for various physiological functions, such as nutrient uptake and growth. Therefore, mineral salts do not exit through stomata.Rate this question:
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- 45.
Which of the following statement is INCORRECT for transpiration?
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Root pressure is involved
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It occurs by stomata, lenticels, and cuticle
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Water comes out as water vapour
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It occurs mostly in all plants
Correct Answer
A. Root pressure is involvedExplanation
Transpiration is the process by which water is lost from a plant through the stomata, lenticels, and cuticle in the form of water vapor. Root pressure, on the other hand, is involved in the process of guttation, which is the exudation of water droplets from the tips of leaves or other plant structures. Therefore, the statement "Root pressure is involved" is incorrect for transpiration.Rate this question:
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- 46.
Which condition(s) favor "Guttation"?
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1. High water absorption
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2. High transpiration
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3. Low transpiration
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4. Both (1) and (3)
Correct Answer
A. 4. Both (1) and (3)Explanation
Guttation is the process by which water droplets are exuded from the tips or edges of leaves. It occurs when there is a high rate of water absorption by the roots and a low rate of transpiration from the leaves. When water absorption is high, the roots take up more water than the plant can transpire, leading to excess water being pushed out through specialized structures called hydathodes. Similarly, when transpiration is low, there is less water loss from the leaves, allowing excess water to accumulate and be released through guttation. Therefore, both high water absorption (1) and low transpiration (3) conditions favor guttation.Rate this question:
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- 47.
Which of the following is NOT true about catabolic wastes in plants cells?
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Carbon dioxide is a waste product of aerobic respiration and oxygen is a waste product of photosynthesis.
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Waste substances are accumulated in concentrations that lead to crystal formation in the cell vacuole.
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Plants can store the waste in organs that are destined to fall off like autumn leaves.
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Organic acids are reused in building up sugars.
Correct Answer
A. Organic acids are reused in building up sugars.Explanation
Organic acids are not reused in building up sugars in plant cells. Instead, they are usually broken down further or excreted as waste products.Rate this question:
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- 48.
The plant excretes the excess water through …..
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Respiration and guttation
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Transpiration and respiration
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Transpiration and guttation
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Transpiration and imbibition
Correct Answer
A. Transpiration and guttationExplanation
Transpiration is the process by which plants release water vapor through small openings called stomata on their leaves. This helps in the regulation of temperature and the transportation of nutrients. Guttation, on the other hand, is the process by which plants release excess water in the form of droplets through specialized structures called hydathodes. Both transpiration and guttation are mechanisms used by plants to get rid of excess water, making the answer "Transpiration and guttation" the correct choice.Rate this question:
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- 49.
Water is lost in a liquid state in some plants through hydathodes. These hydathodes .....
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Show a specificity in opening and closing
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Remain closed during day
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Remain always open
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Remain closed at night
Correct Answer
A. Remain always openExplanation
Hydathodes are specialized structures in plants that allow water to be lost in a liquid state. Unlike stomata, which open and close to regulate gas exchange, hydathodes remain always open. This continuous opening of hydathodes allows for the release of excess water from the plant, a process known as guttation. This helps to maintain the water balance in the plant and prevent damage from excess water accumulation. Therefore, the correct answer is that hydathodes remain always open.Rate this question:
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Mar 09, 2023Quiz Edited by
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Jul 26, 2019Quiz Created by
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