Plants MCQ Quiz - Multiple Choice Questions Answers

Reviewed by Stephen Reinbold
Stephen Reinbold, PhD, Biological Sciences |
Biology Expert
Review Board Member
Stephen Reinbold has a Ph.D. in Biological Sciences with a particular interest in teaching. He taught General Biology, Environmental Science, Zoology, Genetics, and Anatomy & Physiology for almost thirty years at Metropolitan Community College in Kansas City, Missouri. He particularly enjoyed emphasizing scientific methodology and student research projects. Now, enjoying retirement, he works part-time as an editor while also engaging in online activities.
, PhD, Biological Sciences
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Plants MCQ Quiz - Multiple Choice Questions Answers - Quiz

Do you want to test your knowledge of plants with this plants MCQ quiz? This is the unit test for plants. Plants are a huge part of our world, and life without plants is not possible. The quiz below has a lot of questions for you to test your knowledge as well as an understanding of plants and things revolving around them. Let's see how well you know about them. Best of luck to you!


Questions and Answers
  • 1. 

    Which structure is the seed coat?

    • A.

      A

    • B.

      B

    • C.

      C

    Correct Answer
    A. A
    Explanation
    The correct answer is A. In plants, the seed coat is the protective outer covering of a seed. It is formed from the integuments of the ovule and provides protection to the embryo inside the seed. The seed coat helps to prevent desiccation, mechanical damage, and also acts as a barrier against pathogens.

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  • 2. 

    Which structure is an undeveloped plant?

    • A.

      A

    • B.

      B

    • C.

      C

    Correct Answer
    B. B
    Explanation
    Option B is the correct answer because an undeveloped plant refers to a seed, which is the structure that contains the embryo of a plant. It is the initial stage of a plant's life cycle before it starts to grow and develop into a mature plant. Options A and C do not represent an undeveloped plant structure.

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  • 3. 

    Which structure protects the embryo?

    • A.

      A

    • B.

      B

    • C.

      C

    Correct Answer
    A. A
    Explanation
    The structure that protects the embryo is option A.

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  • 4. 

    Which structure supplies food to the embryo?

    • A.

      A

    • B.

      B

    • C.

      C

    Correct Answer
    C. C
    Explanation
    Structure C supplies food to the embryo.

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  • 5. 

    Which structure is the embryo?

    • A.

      A

    • B.

      B

    • C.

      C

    Correct Answer
    B. B
    Explanation
    The correct answer is B because it is the only option that is mentioned as a structure. Options A and C do not provide any information about the embryo.

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  • 6. 

    This structure transports water up the stem.

    • A.

      Sloem

    • B.

      Phloem

    • C.

      Xylem

    • D.

      Tuber

    Correct Answer
    C. Xylem
    Explanation
    Xylem is the correct answer because it is the plant tissue responsible for transporting water and minerals from the roots to the rest of the plant, including the stem. It consists of specialized cells that form tubes, allowing for the upward movement of water through capillary action. The other options listed (sloem, phloem, and tuber) are not involved in water transportation.

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  • 7. 

    Water is transported to the leaves where it combines with ________________ to form sugar.

    • A.

      Oxygen

    • B.

      Carbon dioxide

    • C.

      Glucose

    • D.

      Carbon monoxide

    Correct Answer
    B. Carbon dioxide
    Explanation
    Water is transported to the leaves through the xylem vessels. In the leaves, carbon dioxide is taken in through small openings called stomata. Through the process of photosynthesis, carbon dioxide combines with water in the presence of sunlight and chlorophyll to produce glucose, a type of sugar. This glucose is then used by the plant for energy and growth. Therefore, carbon dioxide is the correct answer as it combines with water to form sugar in the leaves.

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  • 8. 

    Which is not a function of the roots?

    • A.

      Absorb water

    • B.

      Anchor the plant

    • C.

      Photosynthesize

    • D.

      Stores food

    Correct Answer
    C. Photosynthesize
    Explanation
    The roots of a plant have various functions, including absorbing water, anchoring the plant, and storing food. However, roots do not photosynthesize. Photosynthesis is the process by which plants convert sunlight into energy, and it primarily occurs in the leaves of the plant. Therefore, photosynthesis is not a function of the roots.

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  • 9. 

    Which section of the root protects the newly formed cells from damage?

    • A.

      A

    • B.

      B

    • C.

      C

    Correct Answer
    C. C
    Explanation
    Section C of the root protects the newly formed cells from damage.

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  • 10. 

    Where is the root cap located?

    • A.

      A

    • B.

      B

    • C.

      C

    Correct Answer
    C. C
    Explanation
    The root cap is located at the tip of the root, covering and protecting the root's growing tip. It is a structure made up of specialized cells that helps in the absorption of water and nutrients, as well as providing protection to the delicate root tissues as it pushes through the soil during growth.

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  • 11. 

    What do these root structures do for the plant?

    • A.

      Absorb water

    • B.

      Photosynthesize

    • C.

      Dehydration synthesis

    • D.

      Produce important carbon dioxide

    Correct Answer
    A. Absorb water
    Explanation
    Root hair in plants is responsible for absorbing water from the soil. This is a crucial function as water is essential for plant growth and survival. The roots have specialized structures such as root hairs that increase their surface area, allowing for efficient absorption of water and nutrients. Through a process called osmosis, water moves from an area of higher concentration in the soil to an area of lower concentration in the roots. This water is then transported to other parts of the plant, providing hydration and facilitating various physiological processes.

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  • 12. 

    What are these root structures called?

    • A.

      Root Caps

    • B.

      Root Hairs

    • C.

      Vascular cambiums

    • D.

      Stomata

    Correct Answer
    B. Root Hairs
    Explanation
    Root hairs are the thin, elongated extensions of root epidermal cells that increase the surface area of the root for better absorption of water and nutrients from the soil. They are responsible for the majority of water and nutrient uptake in plants. Root caps, on the other hand, are protective coverings at the tip of the root that help in pushing through the soil. Vascular cambiums are meristematic tissues responsible for secondary growth in plants, while stomata are small openings on the surface of leaves that regulate gas exchange. Therefore, the correct answer is Root Hairs.

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  • 13. 

    Phloem is used to transport:

    • A.

      Water up

    • B.

      Water down

    • C.

      Sugar down

    • D.

      Sugar up

    • E.

      Seed dispersal

    Correct Answer
    C. Sugar down
    Explanation
    Phloem is responsible for transporting sugars, specifically glucose and sucrose, from the leaves to other parts of the plant, such as the roots, stems, and fruits. This process is known as translocation. The sugars are produced during photosynthesis in the leaves and are transported downwards to provide energy and nutrients to other plant tissues for growth and metabolism. Therefore, the correct answer is "sugar down."

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  • 14. 

    This structure is where the ovary is located.

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    D. D
    Explanation
    Option D is the correct answer because it is stated that "This structure is where the ovary is located." Since the question is asking for the location of the ovary, option D is the only option that indicates the correct location. Options A, B, and C do not provide any information about the location of the ovary.

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  • 15. 

    This is where the pollen is produced.

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    C. C
    Explanation
    Option C is the correct answer because it states that "This is where the pollen is produced." This suggests that the location being referred to is where the process of pollen production takes place.

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  • 16. 

    Which letter points to the petals?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    A. A
    Explanation
    The letter A points to the petals because it is located at the center of the flower and is surrounded by the curved lines that represent the petals. The other letters (B, C, and D) do not have any connection or indication to the petals.

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  • 17. 

    Which flower structure is this?

    • A.

      Pistil

    • B.

      Sepal

    • C.

      Stamen

    • D.

      Ovary

    Correct Answer
    C. Stamen
    Explanation
    The given flower structure is the stamen. The stamen is the male reproductive part of a flower, consisting of the filament and the anther. The filament holds up the anther, which is responsible for producing and releasing pollen. The stamen plays a crucial role in the process of pollination and fertilization in plants.

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  • 18. 

    Why do flowers have such colorful petals?

    • A.

      To scare away predators.

    • B.

      To attract animals for pollination.

    • C.

      Trap insects

    • D.

      To hide pollen

    Correct Answer
    B. To attract animals for pollination.
    Explanation
    Flowers have colorful petals to attract animals for pollination. The bright colors act as a visual signal to attract pollinators such as bees, butterflies, and birds. These animals are attracted to the flowers because they associate the colors with nectar and pollen, which serve as a food source. As the animals visit the flowers to feed, they inadvertently transfer pollen from one flower to another, aiding in the process of pollination and ensuring the reproduction of the plant.

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  • 19. 

     Which of the following is not a way seeds are dispersed?

    • A.

      Sun

    • B.

      Wind

    • C.

      Water

    • D.

      Animals

    Correct Answer
    A. Sun
    Explanation
    The sun is not a way seeds are dispersed. Seeds are typically dispersed through various methods such as wind, water, or animals. The sun plays a crucial role in the growth and development of plants through photosynthesis, but it does not directly disperse seeds.

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  • 20. 

    What process is being shown here?

    • A.

      Pollination

    • B.

      Germination

    • C.

      Ovation

    • D.

      Photosynthesis

    Correct Answer
    A. Pollination
    Explanation
    The process being shown here is pollination. Pollination is the transfer of pollen from the male reproductive organ (anther) to the female reproductive organ (stigma) of a flower. This process is essential for the fertilization and reproduction of flowering plants. It can occur through various means, including wind, water, or the assistance of animals like bees or butterflies.

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  • 21. 

    Why does water have this effect on seed germination?

    • A.

      It allows for additional photosynthesis.

    • B.

      It softens the seed coat.

    • C.

      It creates additional cotyledons.

    • D.

      It adds a root cap to the embryo.

    Correct Answer
    B. It softens the seed coat.
    Explanation
    Water has this effect on seed germination because it softens the seed coat. The seed coat acts as a protective layer around the seed, and it needs to be softened in order for the seed to absorb water and germinate. When the seed coat is softened, it allows water to penetrate the seed and initiate the germination process. This softening of the seed coat also allows the embryo within the seed to expand and grow, leading to the emergence of a new plant.

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  • 22. 

    What is the variable during this experiment?

    • A.

      Seeds

    • B.

      Water

    • C.

      Germination

    • D.

      Cotyledon width

    Correct Answer
    B. Water
    Explanation
    The variable during this experiment is water. In an experiment, a variable is the factor that is being tested or manipulated. In this case, the experiment likely involves studying the effect of water on the growth or germination of seeds. The other options listed, such as seeds, germination, and cotyledon width, are not variables in this context but rather components or outcomes that may be measured or observed during the experiment.

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  • 23. 

    What plant part is responsible for the majority of photosynthesis?

    • A.

      Leaf

    • B.

      Stem

    • C.

      Flower

    • D.

      Root

    • E.

      Seed

    Correct Answer
    A. Leaf
    Explanation
    Leaves are responsible for the majority of photosynthesis in plants. They contain chlorophyll, a pigment that captures sunlight and converts it into energy through the process of photosynthesis. Leaves have a large surface area and are positioned to receive maximum sunlight exposure. They also have specialized structures called stomata that allow for gas exchange, which is necessary for photosynthesis. Additionally, leaves have a network of veins that transport water and nutrients to the cells involved in photosynthesis. Overall, the leaf's structure and function make it the primary site for photosynthesis in plants.

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  • 24. 

    Which of the following is not a function of the stem?

    • A.

      Supports the leaves

    • B.

      Helps transport sugar and water

    • C.

      Pollination

    • D.

      Germination

    • E.

      Both C and D

    Correct Answer
    E. Both C and D
    Explanation
    Both pollination and germination are not functions of the stem. The stem primarily supports the leaves and helps transport sugar and water throughout the plant. Pollination refers to the transfer of pollen from the male reproductive organ to the female reproductive organ, which is typically carried out by wind, water, or animals. Germination, on the other hand, is the process by which a seed begins to grow and develop into a new plant. These functions are mainly carried out by other parts of the plant such as flowers and seeds, not the stem.

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  • 25. 

    This picture taken with a high-powered microscope is mostly a(n)

    • A.

      Xylem

    • B.

      Anther

    • C.

      Sepals

    • D.

      Ovary

    Correct Answer
    A. Xylem
    Explanation
    This picture taken with a high-powered microscope is mostly xylem. The image likely shows the vascular tissue of a plant, which is responsible for transporting water and nutrients from the roots to the rest of the plant. Xylem is a type of vascular tissue that consists of hollow, tube-like structures called vessels, which are visible in the image. These vessels are responsible for the upward movement of water in the plant.

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  • 26. 

    Where does water enter the plant?

    • A.

      Root

    • B.

      Leaves

    • C.

      Stem

    • D.

      Flower

    Correct Answer
    A. Root
    Explanation
    Water enters the plant through the roots. The roots of a plant have tiny hair-like structures called root hairs, which increase the surface area for absorption. These root hairs absorb water from the soil along with dissolved minerals and nutrients. The water then travels up through the stem and into the leaves, where it is used for photosynthesis and other metabolic processes. Therefore, the correct answer is root.

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  • 27. 

    What are these structures shown here?

    • A.

      Petals

    • B.

      Stamen

    • C.

      Pistils

    • D.

      Anthers

    • E.

      Sepals

    Correct Answer
    E. Sepals
  • 28. 

    What two ingredients are needed for photosynthesis?

    • A.

      Water and Oxygen

    • B.

      Water and Glucose

    • C.

      Water and Carbon Dioxide

    • D.

      Glucose and Oxygen

    • E.

      Glucose and Carbon Dioxide

    Correct Answer
    C. Water and Carbon Dioxide
    Explanation
    Photosynthesis is the process by which plants convert sunlight into energy. Water and carbon dioxide are the two essential ingredients required for this process. Water is absorbed through the plant's roots and transported to the leaves, where it is combined with carbon dioxide from the air. In the presence of sunlight, chlorophyll in the plant's cells uses these two ingredients to produce glucose, a form of sugar, and oxygen as a byproduct. Therefore, water and carbon dioxide are necessary for photosynthesis to occur.

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  • 29. 

    What is the female part of the flower called?

    • A.

      Stamen

    • B.

      Pollen Tube

    • C.

      Pistil

    • D.

      Sepals

    • E.

      Anther

    Correct Answer
    C. Pistil
    Explanation
    The female part of the flower is called the pistil. It is the reproductive structure of the flower that contains the ovary, style, and stigma. The ovary contains the ovules, which develop into seeds after fertilization. The style is the slender tube that connects the ovary to the stigma, where pollen is received. The stigma is the sticky or feathery structure at the top of the pistil, which traps pollen grains for fertilization.

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  • 30. 

    When was this tree cut down?

    • A.

      2004

    • B.

      2006

    • C.

      1998

    • D.

      2002

    Correct Answer
    B. 2006
    Explanation
    The tree was cut down in 2006.

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Stephen Reinbold |PhD, Biological Sciences |
Biology Expert
Stephen Reinbold has a Ph.D. in Biological Sciences with a particular interest in teaching. He taught General Biology, Environmental Science, Zoology, Genetics, and Anatomy & Physiology for almost thirty years at Metropolitan Community College in Kansas City, Missouri. He particularly enjoyed emphasizing scientific methodology and student research projects. Now, enjoying retirement, he works part-time as an editor while also engaging in online activities.

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