Which experiment will best show the effect of gibberellin?
Answer and explanation
Correct answer: Increase in stem length of a dwarf plant
The governing concept is the role of plant hormones in growth. Gibberellin promotes cell elongation and can increase the length of stems, so comparing a treated dwarf plant with an untreated one would provide clear evidence. Therefore option A is correct. Hand withdrawal is a nervous reflex, blood-sugar reduction involves insulin, and pupil contraction is controlled by the nervous system; these effects do not test gibberellin.
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What is the correct answer to this question?
Increase in stem length of a dwarf plant
Why is this the correct answer?
The governing concept is the role of plant hormones in growth. Gibberellin promotes cell elongation and can increase the length of stems, so comparing a treated dwarf plant with an untreated one would provide clear evidence. Therefore option A is correct. Hand withdrawal is a nervous reflex, blood-sugar reduction involves insulin, and pupil contraction is controlled by the nervous system; these effects do not test gibberellin.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
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