Q:

What happens during photosynthesis?

A:

During photosynthesis, chlorophyll absorb light energy that is used to convert carbon dioxide from the air and water from the soil into glucose. Oxygen is released as a by-product. Some glucose is used for respiration, while some is converted into insoluble starch.

Photosynthesis occurs in plants and in some algae. The process takes place in the chloroplasts, primarily in plant leaves. Carbon dioxide enters the leaves through the stomates by diffusion, and water is transported to the leaves in the xylem. The energy harvested through light reaction is stored by forming adenosine triphosphate, or ATP, a chemical compound used for energy storage. This process is called the "dark reaction" and takes place in the stroma. During the Calvin cycle, carbon dioxide and energy from ATP are used to create sugar. Oxygen exits the leaves through the stomata by diffusion, while the plant reuses the water or the water exits through the stomata as water vapor. The plant can combine glucose molecules to form cellulose.

During hot, dry weather, plants keep their stomates closed to decrease the amount of water that evaporates. This results in lower carbon dioxide levels in their leaves, so the plants must stop doing photosynthesis. Most photosynthesis occurs in Earth's oceans, carried out by organisms such as algae and diatoms.

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Related Questions

  • Q:

    When does photosynthesis occur?

    A:

    Photosynthesis, the process by which plants convert the sun's energy to glucose, takes place during daylight hours when the plant's leaves are exposed to sunlight. This process only occurs in green plants and in some protist species. Carbon dioxide and water must also be present in order for photosynthesis to occur.

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  • Q:

    Why are plants called "producers"?

    A:

    Plants are called producers due to their ability to create complex biological compounds like glucose by processing carbon dioxide, sunlight and water. Plants also produce oxygen, contributing the atmosphere that all animals breathe. Producers are found at the base of every ecosystem in the world, providing the foundation of most complex life in the world.

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  • Q:

    What is needed for photosynthesis to occur?

    A:

    For photosynthesis to occur, plants need sunlight, water, carbon dioxide and chlorophyll. Through the process of photosynthesis plants convert light energy into chemical energy. They use this energy to make food which they store as sugars.

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  • Q:

    What are the reactants of photosynthesis?

    A:

    The reactants of photosynthesis are water, carbon dioxide and light energy. Plants use these reactants to make the food that is essential for plant growth.

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