Root growing towards water and a pollen tube growing towards an ovule are examples of what, respectively?
Answer and explanation
Correct answer: Hydrotropism and chemotropism
The governing concept is that tropisms are named according to the stimulus guiding growth. A root growing toward water shows hydrotropism, because water or moisture is the relevant stimulus. A pollen tube grows toward the ovule in response to chemical attractants released by the female reproductive structures, showing chemotropism. Thus option A is correct; the other choices assign unrelated stimuli to one or both examples.
Frequently asked questions
What is the correct answer to this question?
Hydrotropism and chemotropism
Why is this the correct answer?
The governing concept is that tropisms are named according to the stimulus guiding growth. A root growing toward water shows hydrotropism, because water or moisture is the relevant stimulus. A pollen tube grows toward the ovule in response to chemical attractants released by the female reproductive structures, showing chemotropism. Thus option A is correct; the other choices assign unrelated stimuli to one or both examples.
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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