What is phototropism?

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Prepare for the MTTC Integrated Science (Secondary) Test. Utilize flashcards and multiple-choice questions, each accompanied by hints and explanations. Achieve success in your exam journey!

Multiple Choice

What is phototropism?

Explanation:
Phototropism is the growth response of a plant toward light. When light comes from one side, the plant hormone auxin builds up on the shaded side, causing those cells to elongate more and the stem to bend toward the light. This bending is guided by blue-light sensors called phototropins that initiate the signaling leading to growth changes. This helps the plant maximize photosynthesis by keeping leaves exposed to light. The other directional responses are different tropisms: growth away from light is negative phototropism (often seen in roots), growth in response to gravity is gravitropism, and growth in response to touch is thigmotropism.

Phototropism is the growth response of a plant toward light. When light comes from one side, the plant hormone auxin builds up on the shaded side, causing those cells to elongate more and the stem to bend toward the light. This bending is guided by blue-light sensors called phototropins that initiate the signaling leading to growth changes. This helps the plant maximize photosynthesis by keeping leaves exposed to light. The other directional responses are different tropisms: growth away from light is negative phototropism (often seen in roots), growth in response to gravity is gravitropism, and growth in response to touch is thigmotropism.

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