Growth of a pollen tube towards an ovule is based on what type of signal?
Answer and explanation
Correct answer: A chemical signal
The pollen tube must grow directionally through the style toward the ovule. Chemicals released by tissues around the ovule act as guidance signals and attract the growing pollen tube. Directional growth toward a chemical stimulus is called positive chemotropism. Sound and light do not guide this process, and the movement is not explained by an external electric force. Thus, option A is the correct answer.
Frequently asked questions
What is the correct answer to this question?
A chemical signal
Why is this the correct answer?
The pollen tube must grow directionally through the style toward the ovule. Chemicals released by tissues around the ovule act as guidance signals and attract the growing pollen tube. Directional growth toward a chemical stimulus is called positive chemotropism. Sound and light do not guide this process, and the movement is not explained by an external electric force. Thus, option A is the correct answer.
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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