What is common between pollen tube growth towards the ovule and root growth towards water?
Answer and explanation
Correct answer: Both are directional growth responses
The governing concept is directional growth, or tropism. A pollen tube grows towards the ovule in response to chemical guidance, which is positive chemotropism. A root grows towards a region containing more water, showing positive hydrotropism. In each case, the direction of growth is related to the direction of the stimulus, so option A is correct. Reflex actions, the medulla and insulin do not explain these plant responses.
Frequently asked questions
What is the correct answer to this question?
Both are directional growth responses
Why is this the correct answer?
The governing concept is directional growth, or tropism. A pollen tube grows towards the ovule in response to chemical guidance, which is positive chemotropism. A root grows towards a region containing more water, showing positive hydrotropism. In each case, the direction of growth is related to the direction of the stimulus, so option A is correct. Reflex actions, the medulla and insulin do not explain these plant responses.
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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