Why is the growth of a pollen tube towards an ovule considered directional?
Answer and explanation
Correct answer: Because it grows in the direction of chemical signals
The governing concept is chemotropism, a directional growth response to a chemical stimulus. Chemicals released or present near the ovule guide the pollen tube toward it, allowing the male gametes to reach the female gametophyte for fertilisation. Therefore option A is correct. Sound does not guide the tube, pollen tubes have no spinal-cord connection, and insulin is an animal hormone unrelated to this plant process.
Frequently asked questions
What is the correct answer to this question?
Because it grows in the direction of chemical signals
Why is this the correct answer?
The governing concept is chemotropism, a directional growth response to a chemical stimulus. Chemicals released or present near the ovule guide the pollen tube toward it, allowing the male gametes to reach the female gametophyte for fertilisation. Therefore option A is correct. Sound does not guide the tube, pollen tubes have no spinal-cord connection, and insulin is an animal hormone unrelated to this plant process.
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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