On what basis is pollen-tube growth towards an ovule different from ordinary phototropism?
Answer and explanation
Correct answer: It occurs due to chemical signals, not light
The governing concept is chemotropism, a directional growth response to a chemical stimulus. The ovule and surrounding tissues release chemical substances that guide the pollen tube toward the female reproductive structure. Phototropism, in contrast, is growth in response to light. Thus option A is correct. A spinal cord, adrenaline and blood sugar are animal regulatory concepts and do not explain pollen-tube guidance in a flower.
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What is the correct answer to this question?
It occurs due to chemical signals, not light
Why is this the correct answer?
The governing concept is chemotropism, a directional growth response to a chemical stimulus. The ovule and surrounding tissues release chemical substances that guide the pollen tube toward the female reproductive structure. Phototropism, in contrast, is growth in response to light. Thus option A is correct. A spinal cord, adrenaline and blood sugar are animal regulatory concepts and do not explain pollen-tube guidance in a flower.
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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