Q:

What happens during photosynthesis?

A:

Quick Answer

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.

Continue Reading

Full Answer

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.

Learn more about Botany

Related Questions

  • Q:

    What do plants need for photosynthesis?

    A:

    Plants require carbon dioxide, light energy and water to complete photosynthesis. Photosynthesis results in the production of oxygen, water and glucose. Plants use glucose to store energy.

    Full Answer >
    Filed Under:
  • Q:

    What happens during Photosystem II?

    A:

    Photosystem II is the first step of photosynthesis, where the chlorophyll molecule uses light energy to take an electron from a water molecule. This splits the water molecule, generating oxygen and hydrogen ions. The electrons and hydrogen ions are used to power the creation of ATP, and ultimately carbohydrates, in later stages of photosynthesis.

    Full Answer >
    Filed Under:
  • 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.

    Full Answer >
    Filed Under:
  • Q:

    What are the substances needed for photosynthesis?

    A:

    The substances needed for photosynthesis are water, carbon dioxide and chlorophyll. Plants require these three substances in the presence of light to convert light energy into chemical energy.

    Full Answer >
    Filed Under:

Explore