In an experiment a plant was kept horizontal. After some time the root bent downward and the stem bent upward. What combined idea does this prove?
Answer and explanation
Correct answer: Root shows positive and stem shows negative geotropism
The governing concept is directional growth in response to gravity. In a horizontal plant, gravity provides the relevant stimulus. A root growing downward grows in the direction of gravity and is therefore positively geotropic. A stem bending upward grows opposite to gravity and is negatively geotropic. Thus A combines both observations correctly. Phototropism requires light direction, chemotropism requires chemicals, and plants do not use an animal-like nervous system.
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What is the correct answer to this question?
Root shows positive and stem shows negative geotropism
Why is this the correct answer?
The governing concept is directional growth in response to gravity. In a horizontal plant, gravity provides the relevant stimulus. A root growing downward grows in the direction of gravity and is therefore positively geotropic. A stem bending upward grows opposite to gravity and is negatively geotropic. Thus A combines both observations correctly. Phototropism requires light direction, chemotropism requires chemicals, and plants do not use an animal-like nervous system.
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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