How can growth of a root away from light and towards gravity be explained?
Answer and explanation
Correct answer: Negative phototropism and positive geotropism
The governing concept is tropic movement, which is a directional growth response to an external stimulus. A root growing away from light shows negative phototropism. Because it grows in the direction of gravitational pull, it shows positive geotropism, also called positive gravitropism. Chemotropism and thigmotropism involve chemicals and touch respectively, so they do not describe both observations; option A is correct.
Frequently asked questions
What is the correct answer to this question?
Negative phototropism and positive geotropism
Why is this the correct answer?
The governing concept is tropic movement, which is a directional growth response to an external stimulus. A root growing away from light shows negative phototropism. Because it grows in the direction of gravitational pull, it shows positive geotropism, also called positive gravitropism. Chemotropism and thigmotropism involve chemicals and touch respectively, so they do not describe both observations; option A is correct.
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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