- What is phototropism in plants?
- a) Growth towards light
- b) Growth away from light
- c) Growth towards gravity
- d) Growth away from gravity
Answer: a) Growth towards light
- What is the primary hormone involved in phototropism?
- a) Ethylene
- b) Gibberellin
- c) Auxin
- d) Cytokinin
Answer: c) Auxin
- In phototropism, which side of the plant grows faster when exposed to light?
- a) The shaded side
- b) The side facing the light
- c) Both sides grow equally
- d) Neither side grows
Answer: a) The shaded side
- What is gravitropism in plants?
- a) Growth in response to light
- b) Growth in response to gravity
- c) Growth in response to temperature
- d) Growth in response to water
Answer: b) Growth in response to gravity
- Which part of the plant exhibits positive phototropism?
- a) Roots
- b) Leaves
- c) Stems
- d) Flowers
Answer: c) Stems
- In gravitropism, the roots grow in which direction?
- a) Away from gravity
- b) Towards gravity
- c) Toward light
- d) Towards water
Answer: b) Towards gravity
- The bending of a plant stem toward light is an example of?
- a) Gravitropism
- b) Hydrotropism
- c) Phototropism
- d) Thigmotropism
Answer: c) Phototropism
- Which hormone regulates gravitropism in plants?
- a) Cytokinin
- b) Gibberellin
- c) Auxin
- d) Abscisic acid
Answer: c) Auxin
- What causes the bending of the plant stem during phototropism?
- a) Uneven distribution of auxin
- b) Excessive water intake
- c) High levels of light
- d) Growth in the opposite direction
Answer: a) Uneven distribution of auxin
- Which plant part is most sensitive to gravity during gravitropism?
- a) Stem
- b) Roots
- c) Leaves
- d) Flowers
Answer: b) Roots
- In phototropism, what happens to auxin on the side of the stem that is shaded?
- a) It moves to the sunny side
- b) It accumulates on the shaded side
- c) It moves to the root
- d) It disperses evenly
Answer: b) It accumulates on the shaded side
- What is the effect of auxin accumulation on the plant during phototropism?
- a) The stem elongates on the shaded side
- b) The stem elongates on the light-exposed side
- c) The plant remains unaffected
- d) The plant stops growing
Answer: a) The stem elongates on the shaded side
- What type of phototropism do plants generally exhibit?
- a) Negative phototropism
- b) Positive phototropism
- c) Neutral phototropism
- d) None of the above
Answer: b) Positive phototropism
- Which type of tropism is exhibited by the roots in response to gravity?
- a) Negative gravitropism
- b) Positive gravitropism
- c) Positive phototropism
- d) Negative phototropism
Answer: b) Positive gravitropism
- How do plants detect gravity for gravitropism?
- a) By detecting light intensity
- b) Through specialized cells called statocytes
- c) Through temperature changes
- d) By detecting moisture levels
Answer: b) Through specialized cells called statocytes
- In phototropism, the growth response is mainly directed by which environmental factor?
- a) Temperature
- b) Gravity
- c) Light
- d) Water
Answer: c) Light
- What is the term for the bending of a plant towards light?
- a) Geotropism
- b) Phototropism
- c) Hydrotropism
- d) Thermotropism
Answer: b) Phototropism
- What is the effect of a plant’s stem experiencing positive phototropism?
- a) The stem grows away from the light
- b) The stem grows towards the light
- c) The plant stops growing
- d) The plant experiences wilting
Answer: b) The stem grows towards the light
- Which is an example of negative gravitropism in plants?
- a) Roots growing downwards
- b) Roots growing upwards
- c) Leaves growing towards gravity
- d) Stems growing towards gravity
Answer: b) Roots growing upwards
- Which of the following is true about auxin in phototropism?
- a) It decreases on the side facing light
- b) It increases on the shaded side of the stem
- c) It is not involved in phototropism
- d) It has no effect on plant growth
Answer: b) It increases on the shaded side of the stem
- In which of the following is positive gravitropism observed?
- a) Leaves
- b) Roots
- c) Stems
- d) Flowers
Answer: b) Roots
- What role does the statolith play in gravitropism?
- a) It detects light
- b) It helps detect gravity
- c) It regulates water flow
- d) It stores auxins
Answer: b) It helps detect gravity
- What occurs in plants when they experience negative phototropism?
- a) The plant grows towards the light
- b) The plant grows away from the light
- c) The plant dies
- d) The plant does not respond to light
Answer: b) The plant grows away from the light
- Which of the following responses is observed when a plant is exposed to high gravity?
- a) The plant exhibits positive phototropism
- b) The plant exhibits negative phototropism
- c) The plant exhibits increased gravitropism
- d) The plant stops growing
Answer: c) The plant exhibits increased gravitropism
- Which organ of a plant exhibits negative gravitropism?
- a) Stem
- b) Root
- c) Leaf
- d) Flower
Answer: a) Stem
- How does light influence the process of phototropism?
- a) It inhibits auxin movement
- b) It increases auxin concentration on the shaded side
- c) It causes the plant to stop growing
- d) It has no effect on plant growth
Answer: b) It increases auxin concentration on the shaded side
- What is the impact of auxin on root growth in response to gravitropism?
- a) Auxin inhibits root growth
- b) Auxin has no effect on root growth
- c) Auxin promotes root growth towards gravity
- d) Auxin inhibits root growth away from gravity
Answer: c) Auxin promotes root growth towards gravity
- What do plants utilize to detect the direction of light in phototropism?
- a) Statocytes
- b) Chloroplasts
- c) Phytochromes
- d) Hydathodes
Answer: c) Phytochromes
- What happens to the growth of a plant if there is no auxin during phototropism?
- a) The plant continues growing normally
- b) The plant stops responding to light
- c) The plant exhibits excessive growth
- d) The plant grows towards gravity
Answer: b) The plant stops responding to light
- Which of the following is a result of negative phototropism?
- a) The plant’s stem grows away from the light
- b) The roots grow towards the light
- c) The leaves bend towards light
- d) The flowers bend towards the light
Answer: a) The plant’s stem grows away from the light
MCQs on Phototropism and Gravitropism in Plants
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