Why can the stem and root respond differently in phototropism?
Answer and explanation
Correct answer: Because their growth and sensitivity to the stimulus differ
The governing concept is that different plant organs can have different sensitivity and growth responses to the same stimulus. A shoot commonly shows positive phototropism and bends toward light, whereas a root commonly shows negative phototropism and grows away from light; gravity also influences the root strongly. Therefore option A is correct. The other options wrongly attribute the difference to brains, blood, or the origin of light.
Frequently asked questions
What is the correct answer to this question?
Because their growth and sensitivity to the stimulus differ
Why is this the correct answer?
The governing concept is that different plant organs can have different sensitivity and growth responses to the same stimulus. A shoot commonly shows positive phototropism and bends toward light, whereas a root commonly shows negative phototropism and grows away from light; gravity also influences the root strongly. Therefore option A is correct. The other options wrongly attribute the difference to brains, blood, or the origin of light.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
