In the same plant, the root grows towards water and the stem grows towards light. What is this the best evidence of?
Answer and explanation
Correct answer: Different parts of a plant respond to different stimuli according to their needs
The governing concept is coordinated directional growth, or tropic response. Roots commonly show positive hydrotropism and grow towards water, while stems commonly show positive phototropism and grow towards light. These opposite responses in different organs demonstrate that plant parts detect and respond to different environmental stimuli according to their functions and needs. Therefore option A is correct. Options B, C, and D wrongly deny coordination or reverse the usual tropic responses.
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What is the correct answer to this question?
Different parts of a plant respond to different stimuli according to their needs
Why is this the correct answer?
The governing concept is coordinated directional growth, or tropic response. Roots commonly show positive hydrotropism and grow towards water, while stems commonly show positive phototropism and grow towards light. These opposite responses in different organs demonstrate that plant parts detect and respond to different environmental stimuli according to their functions and needs. Therefore option A is correct. Options B, C, and D wrongly deny coordination or reverse the usual tropic 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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