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2 years ago

Practice: Photosynthesis Visual Summary

Biology

1 answer:

Drupady [299]2 years ago

6 0

Photosynthesis takes place in the chloroplast. It involves light-dependent reactions -electron transporter chain- that occur in the thylakoid membrane, and light-independent reactions in the stroma - Calvin cycle-.

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Let us first describe the structures that compose the chloroplast.

In the image, we can see the outer and inner membrane of the organelle.

Between the external and internal membranes, we can see the intermembrane space.

The space surrounded by the inner membrane is the stroma.

The structures found in the stroma are the thylakoids, arranged in piles known as grana.

Thylakoids are also surrounded by a membrane.

The interior of thylakoids is the thylakoid space.

Now, let us talk about photosynthesis

Photosynthesis involves two stages: light-dependent and light-independent reactions.

Light-dependent reactions refer to the non-cyclin pathway –electron transporter chain- that takes place in the thylakoid membrane.

During light-dependent reactions, oxygen is released, while ATP and NADPH are produced. Both of them are used during light-independent reactions.

Light-independent reaction is known as the Calvin cycle, and it takes place in the stroma.

During the Calvin cycle, sugars or carbohydrates are synthesized.

When carbón dioxide, CO₂, enters the leaves through stomas, it diffuses to the chloroplast stroma.

Carbon atoms fixate, meaning that they incorporate into organic molecules. These molecules are used to produce 3-C sugars.

The whole process is impulsed by ATP and NADPH coming from light-dependent reactions.

In the attached files you will see one image showing the structures of the chloroplast and a second image showing the movement of molecules.

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Learn more about photosyntesis at the following link:

brainly.com/question/774815?referrer=searchResults

brainly.com/question/17632381?referrer=searchResults

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