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Phototropism - Life Processes, Science Video Lecture - Class 10

FAQs on Phototropism - Life Processes, Science Video Lecture - Class 10

1. What is phototropism?
Phototropism is a biological process in which plants grow or move towards a light source. It is a type of tropism, which is the growth or movement of an organism in response to a stimulus.
2. How does phototropism occur in plants?
Phototropism occurs in plants due to the hormone called auxin. When a plant is exposed to light, auxin accumulates on the shaded side of the stem. This causes the cells on the shaded side to elongate, bending the stem towards the light source.
3. What are the advantages of phototropism for plants?
Phototropism is advantageous for plants as it allows them to maximize their exposure to sunlight, which is essential for photosynthesis. By growing towards light, plants can ensure that their leaves receive the maximum amount of light energy needed for photosynthesis.
4. Can phototropism occur in all parts of a plant?
No, phototropism primarily occurs in the stem and leaves of a plant. These are the parts that are capable of actively growing and bending towards a light source. Other plant organs, such as roots, do not exhibit phototropism.
5. How is phototropism different from gravitropism?
Phototropism and gravitropism are both types of tropism, but they occur in response to different stimuli. While phototropism is the growth or movement of plants towards light, gravitropism is the growth or movement of plants in response to gravity. In gravitropism, the roots grow downwards towards gravity, while the stems grow upwards against gravity.
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