What is phototropism?

• A. The movement of an organism toward or away from light
• B. The process of photosynthesis in plants
• C. The growth of a plant in response to light direction
• D. The adaptation of plants to different light intensities

Answer: (C)

Verified step by step guidance

1. Phototropism is a biological phenomenon where plants grow towards or away from a light source.
2. This growth response is primarily due to the hormone auxin, which redistributes in the plant in response to light.
3. Auxin accumulates on the side of the plant that is less exposed to light, causing cells to elongate more on that side.
4. As a result, the plant bends towards the light source, optimizing its ability to capture light for photosynthesis.
5. Phototropism is crucial for maximizing light absorption, which is essential for the plant's energy production through photosynthesis.