IB Biology Unit 9

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IB Biology Unit 9 - Quiz

This quiz helps ib student to prepare for a test in unit 9 biology. Plant sciences


Questions and Answers
  • 1. 

    What are non-vascular land plants?

    • A.

      Contiain vascular tissues but do not produce seeds. this includes ferns, and mosses

    • B.

      Flowering plants with seeds that develop inside a protective structure

    • C.

      Do not contain any conducting tissues and are often referred to as Brophytes, and grow close to the ground

    • D.

      Non-flowering plants with seeds that do not develop within an enclosed structure.

    Correct Answer
    C. Do not contain any conducting tissues and are often referred to as Brophytes, and grow close to the ground
    Explanation
    Non-vascular land plants are plants that do not contain any conducting tissues and are often referred to as Bryophytes. These plants lack specialized tissues for transporting water, nutrients, and sugars throughout their bodies. Instead, they rely on direct absorption from their surroundings. Examples of non-vascular land plants include mosses and liverworts. These plants are typically small in size and grow close to the ground, often in moist environments.

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  • 2. 

    Which of the following is not true about Dictyledonous and Monocotyledonous plants?

    • A.

      Dicotyledonous plants have parallel veins; Monocotyledonous have netlike veins

    • B.

      Dicotyledonous have two cotyledons; Monocotyledonous have one cotyledons

    • C.

      Dicotyledonous pollen grains have three openings; Monocotyledonous pollen grains have one

    • D.

      Dicotyledonous tap roots present with lateral branches; Monocotyledonous have a fibrous root system

    Correct Answer
    A. Dicotyledonous plants have parallel veins; Monocotyledonous have netlike veins
    Explanation
    The correct answer states that dicotyledonous plants have parallel veins, while monocotyledonous plants have netlike veins. This is not true. In fact, the opposite is true. Dicotyledonous plants have netlike veins, while monocotyledonous plants have parallel veins.

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  • 3. 

    Which is not true on how terrestrial plants support themselves?

    • A.

      Turgor pressure: It is the resulting pressure in a plant that is exerted on the cell wall due to water stored in the large central vacuole.  Turgor pressure decreases if a plant dries or is exposed to salty conditions.

    • B.

      Lignin is a highly branched polymer found in the xylem cells of terrestrial plants.  These lignified cells have significantly increased support capabilities.  More than 25% of the mass of dry wood can be lignin.

    • C.

      mineral ions that move from lower concentrations of water to a higher concentration using cellular energy.

    • D.

      • Cellulose is a polysaccharide found in plant cell walls of the supporting regions of plants.  The cellulose adds strength and support to the cell walls.

    Correct Answer
    C. mineral ions that move from lower concentrations of water to a higher concentration using cellular energy.
    Explanation
    The statement that mineral ions move from lower concentrations of water to a higher concentration using cellular energy is not true in terms of how terrestrial plants support themselves. Terrestrial plants primarily use turgor pressure, lignin in xylem cells, and cellulose in plant cell walls to support their structure. Turgor pressure is the pressure exerted on the cell wall due to water stored in the central vacuole, while lignin provides increased support capabilities in the xylem cells. Cellulose adds strength and support to the cell walls.

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  • 4. 

    Gaurd cells can do what?

    • A.

      Regulate transpiration by opening and closing the stoma.

    • B.

      Move mineral ions from lower to higher concentrations

    • C.

      Store food and water

    • D.

      Create proteins

    Correct Answer
    A. Regulate transpiration by opening and closing the stoma.
    Explanation
    Guard cells are specialized cells found in the epidermis of plant leaves. They have the ability to regulate transpiration, which is the process of water loss from the plant through the stomata. The stomata are small openings on the surface of leaves that allow for gas exchange. By changing their shape, guard cells can control the opening and closing of the stomata, thereby regulating the amount of water vapor that is released from the plant. This helps to prevent excessive water loss and maintain the plant's water balance.

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  • 5. 

    What causes the closing of the stoma

    • A.

      Plant hormone zerophsic acid which causes the potassium ions to rapidly diffuse out of the guard cells surrounding the stoma

    • B.

      Plant hormone hydrophyes acid which causes the potassium ions to rapidly diffuse out of the guard cells surrounding the stoma

    • C.

      Plant hormone Abscisic acid which causes the potassium ions to rapidly diffuse out of the guard cells surrounding the stoma

    • D.

      Plant hormone mesophytes acid which causes the potassium ions to rapidly diffuse out of the guard cells surrounding the stoma.

    Correct Answer
    C. Plant hormone Abscisic acid which causes the potassium ions to rapidly diffuse out of the guard cells surrounding the stoma
    Explanation
    The correct answer is "plant hormone Abscisic acid which causes the potassium ions to rapidly diffuse out of the guard cells surrounding the stoma." Abscisic acid is a plant hormone that is responsible for the closing of stomata. When the concentration of abscisic acid increases, it triggers the movement of potassium ions out of the guard cells surrounding the stoma. This loss of potassium ions causes water to leave the guard cells through osmosis, leading to the closing of the stomata.

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  • 6. 

    What is the function of the upper cuticle?

    • A.

      Optimum exchanges of gases. helps prevent water loss from the plant

    • B.

      Responsible for photosynthsis.

    • C.

      A protective outer coating that protects the plant from harmful agents such as pathogens. the dermal tissue can also help prevent water loss and often contains specialized structures for specfic purposes

    • D.

      Aid in reducing water loss by decreasing transpiration and protects agianst insect invasion

    Correct Answer
    D. Aid in reducing water loss by decreasing transpiration and protects agianst insect invasion
    Explanation
    The upper cuticle functions as a protective outer coating that aids in reducing water loss by decreasing transpiration and protects against insect invasion. It acts as a barrier, preventing excessive water evaporation from the plant's surface and reducing the risk of dehydration. Additionally, the cuticle acts as a physical barrier against insects and other potential harmful agents, preventing them from entering the plant and causing damage.

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  • 7. 

    What is the function of the palisade layer?

    • A.

      Aids in reducing water loss by decrasing transpiration and protects agianst insect invasion

    • B.

      Responsible for photosynthsis.

    • C.

      Allow for gas exchange and allows for some photosynthesis

    • D.

      Aid in reducing water loss by decreasing transpiration and protects agianst insect invasion

    Correct Answer
    B. Responsible for photosynthsis.
    Explanation
    The correct answer is not "responsible for photosynthesis." The function of the palisade layer in plants is to allow for gas exchange and to facilitate photosynthesis. The palisade layer is located in the upper part of the leaf and contains chloroplasts, which are responsible for capturing light energy and converting it into chemical energy through photosynthesis. This layer is densely packed with elongated cells that are arranged vertically to maximize light absorption.

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  • 8. 

    What is the function of the spongy layer?

    • A.

      Allow for gas exchange and allows for some photosynthesis

    • B.

      A protective outer coating that protects the plant from harmful agents such as pathogens. the dermal tissue can also help prevent water loss and often contains specialized structures for specfic purposes

    • C.

      Aids in reducing water loss, allows light to pass through to the paslisade layer, prevents gas exchange and secretes the waxy cuticle that covers the leaf

    • D.

      Responsible for photosynthsis.

    Correct Answer
    A. Allow for gas exchange and allows for some photosynthesis
    Explanation
    The spongy layer in plants allows for gas exchange and also facilitates some photosynthesis. This layer is located between the palisade layer and the lower epidermis of a leaf. It contains loosely packed cells with air spaces in between, which allow for the exchange of gases such as oxygen and carbon dioxide. Additionally, the spongy layer contains chloroplasts, which enable some photosynthesis to occur. Overall, the spongy layer plays a crucial role in the efficient exchange of gases and contributes to the plant's ability to perform photosynthesis.

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  • 9. 

    What is the function of the veins?

    • A.

      Responsible for photosynthsis.

    • B.

      Composed of thin walled cells that play a role in storage, support, secretion and photosynthsis

    • C.

      Transports the products of photosynthesis and raw materials

    • D.

      Allow for gas exchange and allows for some photosynthesis

    Correct Answer
    C. Transports the products of photosynthesis and raw materials
    Explanation
    The function of the veins is to transport the products of photosynthesis and raw materials. Veins are responsible for carrying the sugars produced during photosynthesis from the leaves to other parts of the plant for storage or immediate use. They also transport water and minerals from the roots to the rest of the plant for various metabolic processes. Additionally, veins provide support to the plant and play a role in the secretion of certain substances. However, veins are not directly involved in photosynthesis itself.

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  • 10. 

    What is the function of the lower cuticle?

    • A.

      Aids in reducing water loss, allows light to pass through to the paslisade layer, prevents gas exchange and secretes the waxy cuticle that covers the leaf

    • B.

      Aids in reducing water loss by decrasing transpiration and protects agianst insect invasion

    • C.

      Allow for gas exchange and allows for some photosynthesis

    • D.

      Composed of thin walled cells that play a role in storage, support, secretion and photosynthsis

    Correct Answer
    B. Aids in reducing water loss by decrasing transpiration and protects agianst insect invasion
    Explanation
    The lower cuticle aids in reducing water loss by decreasing transpiration and protects against insect invasion. The cuticle is a waxy layer that covers the leaf and acts as a barrier, preventing water from evaporating too quickly. This helps to conserve water in the plant. Additionally, the cuticle acts as a protective layer against insects and other potential invaders, preventing them from damaging the leaf. Therefore, the function of the lower cuticle is to reduce water loss and provide protection against insects.

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  • 11. 

    What is the dermal tissue?

    • A.

      Allow for gas exchange and allows for some photosynthesis

    • B.

      A protective outer coating that protects the plant from harmful agents such as pathogens. the dermal tissue can also help prevent water loss and often contains specialized structures for specfic purposes

    • C.

      Composed of thin walled cells that play a role in storage, support, secretion and photosynthsis

    • D.

      Consists of xylem and phloem. they are responsible for conducting water from the roots to the leaves along with water and dissolved minerals. they also provide support and protection for the plant

    Correct Answer
    B. A protective outer coating that protects the plant from harmful agents such as pathogens. the dermal tissue can also help prevent water loss and often contains specialized structures for specfic purposes
    Explanation
    The dermal tissue is a protective outer coating that shields the plant from harmful agents like pathogens. Additionally, it aids in preventing water loss and often contains specialized structures for specific purposes.

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  • 12. 

    What is the ground tissue?

    • A.

      A protective outer coating that protects the plant from harmful agents such as pathogens. the dermal tissue can also help prevent water loss and often contains specialized structures for specfic purposes

    • B.

      Consists of xylem and phloem. they are responsible for conducting water from the roots to the leaves along with water and dissolved minerals. they also provide support and protection for the plant

    • C.

      Aids in reducing water loss by decrasing transpiration and protects agianst insect invasion

    • D.

      Composed of thin walled cells that play a role in storage, support, secretion and photosynthsis

    Correct Answer
    D. Composed of thin walled cells that play a role in storage, support, secretion and photosynthsis
    Explanation
    The ground tissue is composed of thin-walled cells that have multiple functions such as storage, support, secretion, and photosynthesis. These cells are responsible for storing nutrients and water, providing structural support to the plant, secreting substances such as enzymes and hormones, and carrying out photosynthesis to produce energy for the plant. Overall, the ground tissue plays a crucial role in the growth and development of the plant and contributes to its overall functioning.

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  • 13. 

    What is the vascular tissue?

    • A.

      Consists of xylem and phloem. they are responsible for conducting water from the roots to the leaves along with water and dissolved minerals. they also provide support and protection for the plant

    • B.

      A protective outer coating that protects the plant from harmful agents such as pathogens. the dermal tissue can also help prevent water loss and often contains specialized structures for specfic purposes

    • C.

      Composed of thin walled cells that play a role in storage, support, secretion and photosynthsis

    • D.

      Aids in reducing water loss, allows light to pass through to the paslisade layer, prevents gas exchange and secretes the waxy cuticle that covers the leaf

    Correct Answer
    A. Consists of xylem and phloem. they are responsible for conducting water from the roots to the leaves along with water and dissolved minerals. they also provide support and protection for the plant
    Explanation
    The vascular tissue consists of xylem and phloem. Xylem is responsible for conducting water and dissolved minerals from the roots to the leaves, while phloem transports sugars and other organic molecules from the leaves to other parts of the plant. In addition to their transport functions, xylem and phloem also provide support and protection for the plant. Xylem cells have thick walls and are arranged in a way that allows them to provide structural support, while phloem cells are living and can actively respond to changes in the plant's needs.

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  • 14. 

    How does reduced leaves reduce transpiration?

    • A.

      Reduce surface area and number

    • B.

      Reduce water loss

    • C.

      Prevents water loss

    • D.

      Close guard cells

    Correct Answer
    A. Reduce surface area and number
    Explanation
    Reducing the surface area and number of leaves can help reduce transpiration because transpiration primarily occurs through the stomata on the surface of leaves. By reducing the surface area and number of leaves, there are fewer stomata available for water to evaporate from, resulting in less water loss through transpiration. Additionally, reducing the surface area and number of leaves can also reduce the overall surface area exposed to sunlight, which can help prevent excessive water loss due to evaporation.

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  • 15. 

    What is the function of the filament

    • A.

      Hold the stigma

    • B.

      Protect the developing flower

    • C.

      The stalk of the stamen which holds up the anther

    • D.

      Male sex cells

    Correct Answer
    C. The stalk of the stamen which holds up the anther
    Explanation
    The filament is the stalk of the stamen which holds up the anther. The anther is responsible for producing and releasing the male sex cells in plants. Therefore, the function of the filament is to support and hold up the anther, allowing it to release the male sex cells for reproduction.

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  • 16. 

    Which are the male and female sex cells

    • A.

      Sepal and ovary

    • B.

      Anther and ovary

    • C.

      Style and sepal

    • D.

      Stigma and petal

    Correct Answer
    B. Anther and ovary
    Explanation
    The male sex cell in plants is the pollen, which is produced by the anther. The female sex cell is the ovule, which is located in the ovary. Therefore, the correct answer is anther and ovary.

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  • 17. 

    What is the function of the micropyle

    • A.

      New plant when germination occurs

    • B.

      Seed coat. protective layer

    • C.

      The seed leaves that serve as nutrient storage structures

    • D.

      The scar from the opening where the pollen tube had entered the ovule

    Correct Answer
    D. The scar from the opening where the pollen tube had entered the ovule
    Explanation
    The micropyle is the scar from the opening where the pollen tube had entered the ovule. This opening allows the pollen tube to deliver sperm cells to the egg cell for fertilization. Once fertilization occurs, the micropyle closes to prevent any further entry of foreign substances into the ovule. Therefore, the function of the micropyle is to serve as the site of entry for the pollen tube and then act as a protective barrier for the developing embryo inside the ovule.

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  • 18. 

    What is photoperiodicty?

    • A.

      Production of ATP

    • B.

      Blue-green pigment

    • C.

      How a plants response to the length of the night

    • D.

      The development of seeds into a plant

    Correct Answer
    C. How a plants response to the length of the night
    Explanation
    Photoperiodicity refers to how a plant responds to the length of the night. It is a biological process by which plants detect and respond to changes in the duration of daylight and darkness. This response plays a crucial role in regulating various plant processes, such as flowering, growth, and dormancy. Plants use photoreceptors to sense the duration of light and dark periods, which helps them synchronize their growth and development with the changing seasons. By understanding photoperiodicity, scientists can manipulate plant growth and flowering to optimize crop production and control plant behavior.

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  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 08, 2008
    Quiz Created by
    Kmacleod
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