Growth of the pollen tube towards the ovule is an example of what?
Answer and explanation
Correct answer: Chemotropism
The governing concept is chemotropism, a directional growth response to chemical substances. The pollen tube grows toward the ovule because chemical signals released by tissues around the ovule guide its direction. This movement is important for delivering the male gamete to the female gametophyte before fertilisation. Therefore, option A is correct. Phototropism responds to light, geotropism to gravity, and hydrotropism to water, so none of those describes the main stimulus here.
Frequently asked questions
What is the correct answer to this question?
Chemotropism
Why is this the correct answer?
The governing concept is chemotropism, a directional growth response to chemical substances. The pollen tube grows toward the ovule because chemical signals released by tissues around the ovule guide its direction. This movement is important for delivering the male gamete to the female gametophyte before fertilisation. Therefore, option A is correct. Phototropism responds to light, geotropism to gravity, and hydrotropism to water, so none of those describes the main stimulus here.
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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