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PHOTOSYNTHESIS - Nutrition in Plants (Overview) - CBSE Class 7 Science Video Lecture

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FAQs on PHOTOSYNTHESIS - Nutrition in Plants (Overview) - CBSE Class 7 Science Video Lecture

1. What is photosynthesis?
Ans. Photosynthesis is the process by which green plants, algae, and some bacteria convert sunlight, carbon dioxide, and water into glucose (a type of sugar) and oxygen. This process occurs in the chloroplasts of plant cells.
2. Why is photosynthesis important for plants?
Ans. Photosynthesis is crucial for plants as it is the primary way they obtain their food. Through photosynthesis, plants convert sunlight into chemical energy in the form of glucose, which is used for growth, development, and reproduction. Additionally, photosynthesis releases oxygen into the atmosphere, which is essential for the survival of all living organisms.
3. How does photosynthesis occur in plants?
Ans. Photosynthesis occurs in the chloroplasts of plant cells. Chlorophyll, a pigment present in chloroplasts, captures sunlight energy. This energy is used to convert carbon dioxide and water into glucose and oxygen. The process involves two main stages: the light-dependent reactions and the light-independent reactions (also known as the Calvin cycle).
4. What are the requirements for photosynthesis?
Ans. Photosynthesis requires three essential components: sunlight, carbon dioxide, and water. Sunlight provides the energy needed for the process, while carbon dioxide and water act as raw materials. Additionally, chlorophyll, present in the chloroplasts, is necessary for capturing sunlight energy.
5. How does photosynthesis contribute to the environment?
Ans. Photosynthesis is a vital process that contributes to the environment in several ways. Firstly, it is responsible for the production of oxygen, which is essential for the survival of all living organisms. Secondly, photosynthesis helps in the removal of carbon dioxide from the atmosphere, reducing the greenhouse effect and regulating the Earth's climate. Additionally, photosynthesis plays a crucial role in the food chain, as it is the primary source of energy for most ecosystems.
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