Explore Life Sciences: Grade 8 Biology Quiz
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Welcome to the 8th Grade Biology Test! This quiz is designed to assess your knowledge and understanding of fundamental biological concepts suitable for 8th-grade students. Explore a range of topics, including cell structure, genetics, ecology, and human biology. Each question is crafted to challenge your understanding and critical thinking skills, ensuring a comprehensive assessment of your biology knowledge. With a variety of question types, including multiple-choice, true/false, and short-answer, this test provides a well-rounded review experience. Use it as an opportunity to identify areas for improvement and reinforce your understanding of key concepts. Are you ready to put your Read morebiology knowledge to the test? Let's dive in and see how well you fare on the 8th Grade Biology Test!
Grade 8 Biology Questions and Answers
- 1.
One of the substances that are needed for to photosynthesis process is .......................
- A.
Oxygen
- B.
Mineral salt
- C.
Glucose
- D.
Amylum
Correct Answer
B. Mineral saltExplanation
Mineral salt is one of the substances needed for the process of photosynthesis. It provides essential nutrients and minerals to the plant, which are required for the synthesis of organic compounds during photosynthesis. Without mineral salts, plants would not be able to produce glucose, oxygen, and other necessary compounds for their growth and survival.Rate this question:
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- 2.
One of the substances produced by photosynthesis is...................................
- A.
Water
- B.
Chlorophyll
- C.
Oxygen
- D.
Carbon dioxide
Correct Answer
C. OxygenExplanation
Oxygen is one of the substances produced by photosynthesis. During the process of photosynthesis, plants use sunlight, water, and carbon dioxide to produce glucose (a type of sugar) and oxygen. The oxygen is released into the atmosphere as a byproduct of photosynthesis and is essential for the survival of many living organisms, including humans.Rate this question:
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- 3.
When does photosynthesis happen?
- A.
Night
- B.
All of day
- C.
When there is light
- D.
Every time
Correct Answer
C. When there is lightExplanation
Photosynthesis is a process in which plants use sunlight, carbon dioxide, and water to produce glucose and oxygen. Therefore, photosynthesis can only occur if there is light available for the plants to capture and convert into energy. In the absence of light, such as during the night, photosynthesis cannot take place. Hence, the correct answer is "if there is light".Rate this question:
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- 4.
In the photosynthesis experiment, gas bubbles produced by pond weed are.....
- A.
Carbon dioxide
- B.
Ozone
- C.
Oxygen
- D.
Hydrogen
Correct Answer
C. OxygenExplanation
In a photosynthesis experiment, the gas bubbles produced by pond weed indicate the release of oxygen. During photosynthesis, plants use sunlight, water, and carbon dioxide to produce glucose and oxygen. The oxygen is a byproduct of this process and is released into the surrounding environment in the form of gas bubbles. Therefore, the correct answer is oxygen.Rate this question:
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- 5.
The function of sodium hydrogencarbonate is......
- A.
Increase light number
- B.
Decrease oxygen number
- C.
Increase oxygen that dissolve in water
- D.
Increase carbon dioxide that dissolve in water
Correct Answer
D. Increase carbon dioxide that dissolve in waterExplanation
Sodium hydrogencarbonate, also known as baking soda, functions to increase the amount of carbon dioxide that dissolves in water. When sodium hydrogencarbonate is dissolved in water, it releases carbon dioxide gas. This gas can then dissolve in the water, increasing the concentration of carbon dioxide in the solution. This property of sodium hydrogencarbonate is often utilized in baking and cooking to help dough rise and create a lighter texture in baked goods.Rate this question:
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- 6.
John conducted a photosynthesis experiment using Lugol, alcohol, and other substances. He used two samples of leaves. One leaf is covered by aluminum foil, and the other is not covered by aluminum foil. What is the function of Lugol?
- A.
Killing the pathogen (virus, bacteria, and other microorganism)
- B.
Testing amylum in leaf
- C.
Loosing chlorophyll in leaf
- D.
Increase photosynthesis rate
Correct Answer
B. Testing amylum in leafExplanation
The function of lugol is to test for the presence of amylum in the leaf. Lugol is a solution that contains iodine, which reacts with starch (amylum) to form a blue-black color. By applying lugol to the leaf, John can determine if there is starch present, indicating that photosynthesis has occurred.Rate this question:
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- 7.
The function of alcohol from the Lugol experiment is?
- A.
Killing pathogens
- B.
Testing amylum
- C.
Losing chlorophyll
- D.
Increase photosynthesis rate
Correct Answer
C. Losing chlorophyllExplanation
Alcohol functions by loosening chlorophyll. Chlorophyll is responsible for the green color in plants and plays a crucial role in photosynthesis. When alcohol is applied to plants, it breaks down the chlorophyll molecules, causing the green color to fade. This process is often used in laboratory experiments or research to remove chlorophyll and study other plant pigments or compounds.Rate this question:
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- 8.
In a photosynthesis experiment, John also boils the leaf. The function is...
- A.
Killing pathogen
- B.
Testing amylum
- C.
Loosing chlorophyll
- D.
Increasing photosynthesis rate
Correct Answer
A. Killing pathogenExplanation
Boiling the leaf in photosynthesis experiments would serve the purpose of killing any pathogens present on the leaf. This step is important to ensure that the results of the experiment are not influenced by any potential diseases or infections that could affect the photosynthesis process. By eliminating pathogens, the experiment can focus solely on studying the effects of photosynthesis without any interference.Rate this question:
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- 9.
The function of the Lugol experiment is......
- A.
Show that product of photosynthesis is water
- B.
Show that product of photosynthesis is carbon dioxide
- C.
Show that product of photosynthesis is amylum
- D.
Show that product of photosynthesis is oxygen
Correct Answer
C. Show that product of photosynthesis is amylumExplanation
The correct answer is "show that product of photosynthesis is amylum". This is because amylum, also known as starch, is one of the main products of photosynthesis in plants. During photosynthesis, plants use sunlight, carbon dioxide, and water to produce glucose, which is then converted into starch for storage purposes. Therefore, conducting experiments to show the presence of amylum in plants would provide evidence of the product of photosynthesis.Rate this question:
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- 10.
The function of xylem is......
- A.
Transport water and mineral
- B.
Transport oxygen
- C.
Transport result of photosynthesis
- D.
Transport amylum
Correct Answer
A. Transport water and mineralExplanation
The function of xylem is to transport water and minerals. Xylem is a type of vascular tissue in plants that is responsible for conducting water and nutrients from the roots to the rest of the plant. It consists of specialized cells called tracheids and vessel elements that form long tubes, allowing for the efficient movement of water and minerals throughout the plant. This process is essential for the plant's survival as it provides the necessary hydration and nutrients needed for growth and metabolism.Rate this question:
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- 11.
Function of phloem is....
- A.
Transport water and mineral
- B.
Transport oxygen
- C.
Transport result of photosynthesis
- D.
Transport carbon dioxide
Correct Answer
C. Transport result of photosynthesisExplanation
The function of phloem is to transport the result of photosynthesis. Phloem is a vascular tissue in plants responsible for the transportation of organic nutrients, such as sugars and amino acids, produced during photosynthesis. These nutrients are transported from the leaves, where photosynthesis occurs, to other parts of the plant, such as the roots, stems, and fruits, where they are needed for growth, energy production, and storage. This transportation is essential for the overall functioning and survival of the plant.Rate this question:
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- 12.
In the root, water entering the xylem without crossing the cell membrane is called?
- A.
Symplast
- B.
Apoplast
- C.
Casparian strip
- D.
Plasmodesmata
Correct Answer
B. ApoplastExplanation
In the root, water can enter the xylem without crossing cell membranes through a pathway called the apoplast. The apoplast pathway refers to the movement of water through the cell walls and intercellular spaces of the root, bypassing the cell membranes. This pathway allows for efficient water transport in plants. Symplast refers to the movement of water through the cytoplasm of plant cells, casparian strip is a waterproof barrier in the endodermis that forces water to cross cell membranes, and plasmodesmata are channels that connect plant cells and allow for communication and transport between them.Rate this question:
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- 13.
Water moves from one cell to another cell passing through.....
- A.
Symplast
- B.
Apoplast
- C.
Casparian strip
- D.
Plasmodesmata
Correct Answer
D. PlasmodesmataExplanation
Plasmodesmata are small channels that connect plant cells, allowing for the movement of water and other substances between cells. These channels are made up of cytoplasmic strands that pass through the cell walls of adjacent cells, creating a continuous pathway for the flow of water and solutes. Therefore, plasmodesmata facilitate the movement of water from one cell to another within the plant.Rate this question:
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- 14.
Part of the cell that has the function to prevent water moves in the endodermis is?
- A.
Casparian strip
- B.
Plasmodesmata
- C.
Stomata
- D.
Cell wall
Correct Answer
A. Casparian stripExplanation
The Casparian strip is a specialized structure found in the endodermis of plant roots. It is made up of a waterproof material called suberin, which prevents water from moving freely through the cell walls of the endodermal cells. This strip forces water and solutes to pass through the selectively permeable plasma membranes of the endodermal cells, allowing the plant to control the uptake of water and nutrients from the soil. In this way, the Casparian strip acts as a barrier to regulate the movement of water and ions into the vascular tissues of the plant.Rate this question:
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- 15.
One of the factors that influence the absorption of water and mineral salt in plants is .....
- A.
Root pressure
- B.
Kind of plant
- C.
Size of xylem
- D.
Number of water
Correct Answer
A. Root pressureExplanation
Root pressure is one of the factors that influence the absorption of water and mineral salts in plants. Root pressure refers to the force created by the active transport of ions into the root cells, which causes water to move into the roots and up the xylem vessels. This pressure helps to push water and nutrients upwards from the roots to the rest of the plant. Therefore, root pressure plays a crucial role in the absorption and transportation of water and minerals in plants.Rate this question:
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- 16.
One factor that influences water entering the xylem vessel is....
- A.
Size of xylem
- B.
Rigid xylem
- C.
Number of xylem
- D.
Number of water
Correct Answer
B. Rigid xylemExplanation
Rigid xylem is the correct answer because the rigidity of the xylem vessels allows them to withstand the pressure exerted by the water as it moves upwards through the plant. The rigid walls of the xylem vessels prevent them from collapsing under the tension created by the transpiration pull, thus facilitating the movement of water from the roots to the leaves.Rate this question:
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- 17.
Transpiration theory is....
- A.
Condensation of water
- B.
Boiling of water in the leaf
- C.
Evaporation of water in leaf
- D.
Freezing of plant
Correct Answer
C. Evaporation of water in leafExplanation
The correct answer is the evaporation of water in the leaf. Transpiration is the process by which water is lost from the leaves of plants through small openings called stomata. These stomata allow water to evaporate from the leaf surface, creating a concentration gradient that pulls water up from the roots through the xylem vessels. This process is essential for the plant's water uptake, nutrient transport, and cooling. It also helps maintain the plant's shape and structure.Rate this question:
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- 18.
Vascular bundles in plants consist of.....
- A.
Cell membrane and cell wall
- B.
Plasmodesmata and casparian strip
- C.
Xylem and phloem
- D.
Root and stem
Correct Answer
C. Xylem and phloemExplanation
Vascular bundles in plants consist of xylem and phloem. Xylem is responsible for transporting water and minerals from the roots to the rest of the plant, while phloem transports sugars and other organic compounds from the leaves to other parts of the plant. These two tissues work together to ensure the proper functioning and growth of the plant.Rate this question:
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- 19.
Water and mineral salt can be absorbed by the root easily because......
- A.
Root pressure, stem capillarity, transpiration pull
- B.
Root pressure, size of stem, transpiration pull
- C.
Root pressure, size of stem, kinds of plant
- D.
Sunlight, size of stem, transpiration pull
Correct Answer
A. Root pressure, stem capillarity, transpiration pullExplanation
Water and mineral salts can be absorbed by roots easily due to a combination of root pressure, stem capillarity, and transpiration pull. Root pressure refers to the force created by the active pumping of ions into the root cells, which increases the water potential and drives water uptake. Stem capillarity allows water to move upwards through tiny tubes in the stem, aided by adhesive and cohesive forces. Transpiration pull is caused by the evaporation of water from the leaves, creating a negative pressure that pulls water upwards from the roots. These three mechanisms work together to facilitate the efficient absorption and transport of water and minerals in plants.Rate this question:
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- 20.
The function of the root cap is.....
- A.
Absorb water
- B.
Enlarge the absorption of water
- C.
Growth of root
- D.
Protects apical meristem
Correct Answer
D. Protects apical meristemExplanation
The root cap is responsible for protecting the apical meristem, which is the growing tip of the root. The apical meristem is a delicate and important part of the root that is responsible for the growth and development of the root. The root cap acts as a barrier, shielding the apical meristem from damage as the root pushes through the soil. It also helps in detecting gravity, allowing the root to grow downwards. Therefore, the function of the root cap is to protect the apical meristem.Rate this question:
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Mar 28, 2024Quiz Edited by
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Sep 23, 2012Quiz Created by
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