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Q1. Which hormone is involved in the regulation of stomatal closure during water stress? (2023)
Solution:
Abscisic acid is involved in the regulation of stomatal closure during water stress to prevent water loss.
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Q2. Which of the following is a function of cytokinins in plants? (2019)
Solution:
Cytokinins promote shoot development and are involved in delaying leaf senescence.
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Q3. What is the primary role of auxins in apical dominance? (2019)
Solution:
Auxins inhibit the growth of lateral buds, maintaining apical dominance and directing growth towards the apex.
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Q4. Which plant hormone is primarily involved in the elongation of stems? (2023)
Solution:
Gibberellins are primarily responsible for stem elongation by promoting cell division and elongation.
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Q5. What effect do gibberellins have on seed germination? (2020)
Solution:
Gibberellins promote seed germination by breaking dormancy and stimulating the growth of the embryo.
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Q6. What is the effect of photoperiod on flowering in plants? (2020)
Solution:
Photoperiod is crucial in determining the timing of flowering in many plants, influencing their reproductive cycle.
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Q7. Which of the following processes is directly influenced by auxins? (2021)
Solution:
Auxins are responsible for phototropism, the growth of plants towards light.
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Q8. Which of the following is a characteristic of phototropism? (2019)
Solution:
Phototropism is the growth of a plant towards light, facilitated by auxins.
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Q9. Which plant hormone is known for its role in apical dominance? (2023)
Solution:
Auxins are responsible for maintaining apical dominance by inhibiting the growth of lateral buds.
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Q10. Which of the following is a function of cytokinins? (2019)
Solution:
Cytokinins stimulate lateral bud growth and delay leaf senescence.
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