What is the combined meaning of positive geotropism and negative phototropism in roots?
Answer and explanation
Correct answer: Root grows towards gravity and away from light
The governing concept is directional growth, or tropism. “Positive” geotropism means growth in the direction of gravity, so a root generally grows downward into the soil. “Negative” phototropism means growth away from light. Therefore, both descriptions together identify option A. Option B reverses both directions, while options C and D describe chemical or touch responses rather than the two stated stimuli.
Frequently asked questions
What is the correct answer to this question?
Root grows towards gravity and away from light
Why is this the correct answer?
The governing concept is directional growth, or tropism. “Positive” geotropism means growth in the direction of gravity, so a root generally grows downward into the soil. “Negative” phototropism means growth away from light. Therefore, both descriptions together identify option A. Option B reverses both directions, while options C and D describe chemical or touch responses rather than the two stated stimuli.
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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