Plant Biology MCQs with Answers

What is the primary function of the root system in plants?
a) Absorption of water and nutrients
b) Photosynthesis
c) Reproduction
d) Transport of sugars
Answer: a) Absorption of water and nutrients

Which part of the plant is responsible for the production of seeds?
a) Roots
b) Stem
c) Leaves
d) Flowers
Answer: d) Flowers

Which of the following structures is responsible for gas exchange in plants?
a) Stomata
b) Xylem
c) Phloem
d) Cuticle
Answer: a) Stomata

What is the process by which plants convert sunlight into chemical energy?
a) Respiration
b) Transpiration
c) Photosynthesis
d) Germination
Answer: c) Photosynthesis

Which pigment is responsible for capturing light energy during photosynthesis?
a) Chlorophyll
b) Carotenoids
c) Anthocyanins
d) Xanthophylls
Answer: a) Chlorophyll

What is the primary function of the leaves in plants?
a) Anchoring the plant
b) Absorption of water and nutrients
c) Photosynthesis
d) Reproduction
Answer: c) Photosynthesis

Which plant hormone promotes cell elongation and growth?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Ethylene
Answer: a) Auxin

Which of the following is responsible for the transport of water and minerals from the roots to the rest of the plant?
a) Xylem
b) Phloem
c) Stomata
d) Cuticle
Answer: a) Xylem

Which part of the plant is responsible for supporting the plant and transporting water and nutrients?
a) Roots
b) Stem
c) Leaves
d) Flowers
Answer: b) Stem

Which of the following is the male reproductive structure of a flower?
a) Stamen
b) Pistil
c) Sepal
d) Petal
Answer: a) Stamen

What is the process by which water is lost from the leaves of a plant?
a) Transpiration
b) Photosynthesis
c) Respiration
d) Germination
Answer: a) Transpiration

Which of the following plant hormones is responsible for promoting cell division and differentiation?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Ethylene
Answer: c) Cytokinin

What is the primary function of the flower in plants?
a) Anchoring the plant
b) Absorption of water and nutrients
c) Photosynthesis
d) Reproduction
Answer: d) Reproduction

Which of the following is the female reproductive structure of a flower?
a) Stamen
b) Pistil
c) Sepal
d) Petal
Answer: b) Pistil

What is the process by which plants produce new offspring?
a) Photosynthesis
b) Transpiration
c) Reproduction
d) Germination
Answer: c) Reproduction

Which plant hormone is responsible for promoting fruit ripening?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Ethylene
Answer: d) Ethylene

What is the function of the cuticle in plants?
a) Anchoring the plant
b) Absorption of water and nutrients
c) Protection against water loss
d) Reproduction
Answer: c) Protection against water loss

Which of the following is a function of the root hairs in plants?
a) Photosynthesis
b) Absorption of water and nutrients
c) Reproduction
d) Protection against water loss
Answer: b) Absorption of water and nutrients

Which plant hormone is responsible for regulating plant growth responses to light?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Ethylene
Answer: a) Auxin

What is the primary function of the seeds in plants?
a) Anchoring the plant
b) Absorption of water and nutrients
c) Photosynthesis
d) Reproduction
Answer: d) Reproduction

Which of the following is responsible for the transport of organic compounds in plants?
a) Xylem
b) Phloem
c) Stomata
d) Cuticle
Answer: b) Phloem

Which part of the plant is responsible for anchoring the plant and absorbing water and nutrients?
a) Roots
b) Stem
c) Leaves
d) Flowers
Answer: a) Roots

What is the function of the sepals in a flower?
a) Anchoring the plant
b) Protection of the flower bud
c) Absorption of water and nutrients
d) Reproduction
Answer: b) Protection of the flower bud

Which of the following is a function of the petal in a flower?
a) Anchoring the plant
b) Protection of the flower bud
c) Absorption of water and nutrients
d) Attracting pollinators
Answer: d) Attracting pollinators

What is the process by which a seed begins to grow into a new plant?
a) Respiration
b) Transpiration
c) Photosynthesis
d) Germination
Answer: d) Germination

Which of the following is responsible for the transport of sugars from the leaves to other parts of the plant?
a) Xylem
b) Phloem
c) Stomata
d) Cuticle
Answer: b) Phloem

Which plant hormone is responsible for promoting seed germination and breaking dormancy?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Ethylene
Answer: b) Gibberellin

What is the primary function of the stomata in plants?
a) Anchoring the plant
b) Absorption of water and nutrients
c) Transpiration and gas exchange
d) Reproduction
Answer: c) Transpiration and gas exchange

Which of the following is responsible for the transport of water and dissolved nutrients in a plant?
a) Xylem
b) Phloem
c) Stomata
d) Cuticle
Answer: a) Xylem

Which part of the plant is responsible for the production of food through photosynthesis?
a) Roots
b) Stem
c) Leaves
d) Flowers
Answer: c) Leaves

What is the process by which plants respond to the direction of gravity?
a) Phototropism
b) Geotropism
c) Thigmotropism
d) Hydrotropism
Answer: b) Geotropism

Which of the following is responsible for the transport of water from the roots to the leaves of a plant?
a) Xylem
b) Phloem
c) Stomata
d) Cuticle
Answer: a) Xylem

Which plant hormone is responsible for promoting leaf abscission (shedding) in deciduous trees?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Ethylene
Answer: d) Ethylene

What is the function of the pericycle in a plant?
a) Anchoring the plant
b) Protection of the flower bud
c) Absorption of water and nutrients
d) Formation of lateral roots
Answer: d) Formation of lateral roots

Which of the following is responsible for the opening and closing of stomata?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Guard cells
Answer: d) Guard cells

What is the function of the cambium in a plant?
a) Anchoring the plant
b) Protection of the flower bud
c) Absorption of water and nutrients
d) Formation of new vascular tissue
Answer: d) Formation of new vascular tissue

Which of the following is responsible for the transport of sugars from the leaves to the roots of a plant?
a) Xylem
b) Phloem
c) Stomata
d) Cuticle
Answer: b) Phloem

Which plant hormone is responsible for promoting root development and branching?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Ethylene
Answer: a) Auxin

What is the primary function of the thylakoid membranes in chloroplasts?
a) Anchoring the plant
b) Absorption of water and nutrients
c) Photosynthesis
d) Reproduction
Answer: c) Photosynthesis

Which of the following is responsible for the transport of sugars from the leaves to the fruits of a plant?
a) Xylem
b) Phloem
c) Stomata
d) Cuticle
Answer: b) Phloem

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