HORTICULTURE SCIENCE
ULTRA STRUCTURE OF PLANT CELLS AND ORGANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is caused by an electrical signal.
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Phototropism is enhanced by removing the stomata.
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A growth increase on one side of the stem is caused by the plant hormone auxin.
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A growth decrease occurs on the side of the stem facing the light caused by the plant hormone auxin.
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Detailed explanation-1: -When given only a small source of light, plants will grow toward the light source in a response called phototropism. Which of the following statements is true regarding phototropism? It is caused by an electrical signal.
Detailed explanation-2: -The shoots of the plant grow toward the light, and the roots grow away from the light. A plants’ response to gravity is known as geotropism. In general, most plant shoots grow up, away from the ground (negative geotropism).
Detailed explanation-3: -The bending of the plant towards light is known as phototropism. It is due to the plant hormone auxins. When the growing parts of a phototropic plant detect sunlight, auxins (synthesized at the shoot tips) help the cells grow longer.