Photosynthesis and Cellular Respiration

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What is photosynthesis?

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Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy stored in glucose. It occurs primarily in chloroplasts and involves light-dependent reactions and the Calvin Cycle.

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What is chlorophyll?

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Chlorophyll is the green pigment in chloroplasts responsible for capturing light energy from the sun. It absorbs light most effectively in the blue and red wavelengths, reflecting green light.

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What are chloroplasts?

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Chloroplasts are the organelles in plant cells where photosynthesis takes place. They contain chlorophyll and other pigments, as well as structures necessary for light-dependent reactions and the Calvin Cycle.

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What is light energy in photosynthesis?

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Light energy is the energy from the sun that drives photosynthesis. It is absorbed by chlorophyll and used to excite electrons, initiating the light-dependent reactions.

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What role does carbon dioxide play in photosynthesis?

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Carbon dioxide is absorbed from the atmosphere through stomata and used in the Calvin Cycle to form glucose during carbon fixation.

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What role does water play in photosynthesis?

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Water is a raw material for photosynthesis, absorbed by plant roots. It is split during the light-dependent reactions, producing oxygen and providing electrons and protons for energy production.

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What is oxygen's role in photosynthesis?

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Oxygen is a byproduct of photosynthesis, released into the atmosphere when water molecules are split during the light-dependent reactions.

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What is ATP in photosynthesis?

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ATP is a high-energy molecule produced during the light-dependent reactions. It provides the energy needed for the Calvin Cycle to synthesize glucose.

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What is NADPH in photosynthesis?

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NADPH is an electron carrier molecule generated in the light-dependent reactions. It provides high-energy electrons required for the Calvin Cycle to reduce carbon dioxide into glucose.

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What is the Calvin Cycle?

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The Calvin Cycle, also known as the light-independent reactions, occurs in the stroma of chloroplasts. It uses ATP and NADPH from the light-dependent reactions to fix carbon dioxide and produce glucose.