If phototropism is normal in a plant but chemotropism is blocked, which process may be affected?
Answer and explanation
Correct answer: Growth of the pollen tube towards the ovule
Phototropism is a directional growth response to light, whereas chemotropism is a directional growth response to chemical substances. During fertilisation in flowering plants, the pollen tube grows towards the ovule in response to chemical signals released by tissues around it. Thus, blocked chemotropism may affect pollen-tube growth, making option A correct. Option B describes phototropism, while C and D are animal processes.
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What is the correct answer to this question?
Growth of the pollen tube towards the ovule
Why is this the correct answer?
Phototropism is a directional growth response to light, whereas chemotropism is a directional growth response to chemical substances. During fertilisation in flowering plants, the pollen tube grows towards the ovule in response to chemical signals released by tissues around it. Thus, blocked chemotropism may affect pollen-tube growth, making option A correct. Option B describes phototropism, while C and D are animal processes.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Control and Coordination. Topic: Plant hormones.
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