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Photosynthesis Video Lecture | Science Class 7 (Old NCERT)
FAQs on Photosynthesis Video Lecture - Science Class 7 (Old NCERT)
| 1. What is photosynthesis? |  |
Ans. Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy stored in glucose molecules.
| 2. How does photosynthesis occur in plants? | |
Ans. Photosynthesis occurs in the chloroplasts of plant cells. Chlorophyll, a pigment in the chloroplasts, absorbs sunlight and uses it to convert carbon dioxide and water into glucose and oxygen.
| 3. Why is photosynthesis important for life on Earth? | |
Ans. Photosynthesis is essential for life on Earth as it is the primary way in which oxygen is produced and carbon dioxide is removed from the atmosphere. It is also the basis of the food chain, providing energy for all living organisms.
| 4. What are the two stages of photosynthesis? | |
Ans. The two stages of photosynthesis are the light-dependent reactions and the light-independent reactions (Calvin cycle). In the light-dependent reactions, light energy is used to split water molecules and produce ATP and NADPH. In the Calvin cycle, ATP and NADPH are used to convert carbon dioxide into glucose.
| 5. How do environmental factors such as light intensity and temperature affect photosynthesis? | |
Ans. Photosynthesis is influenced by factors such as light intensity, temperature, and the availability of water and carbon dioxide. Higher light intensity and optimal temperature levels can increase the rate of photosynthesis, while extreme conditions can inhibit the process.
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Video Description: Photosynthesis for Class 7 2025 is part of Science Class 7 (Old NCERT) preparation.
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