The Two-stage Photosynthesis Model Flashcards

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What does the two-stage photosynthesis model show?

It shows that photosynthesis happens in two linked steps. First, light splits water. Then, hydrogen from the water reacts with carbon dioxide to make glucose.

What happens in the first stage of the two-stage photosynthesis model?

Light energy is absorbed by chlorophyll and used to split water into oxygen and hydrogen.

Which gas is made in the first stage of photosynthesis, and what happens to it?

Oxygen gas is made in the first stage. It leaves the leaf as a waste product.

What happens to the hydrogen made in the first stage of photosynthesis?

The hydrogen is kept in the chloroplast and used in the second stage to help make glucose.

What happens in the second stage of the two-stage photosynthesis model?

Hydrogen from the first stage reacts with carbon dioxide from the air to make glucose.

Which substances are needed for the first stage of photosynthesis in the two-stage model?

The first stage needs light energy and water inside the chloroplasts.

Which substances are needed for the second stage of photosynthesis in the two-stage model?

The second stage needs hydrogen from the first stage and carbon dioxide from the air.

Which stage of the two-stage photosynthesis model needs light energy directly?

Only the first stage needs light energy directly, because light is used to split water.

In the two-stage model, where does the oxygen released in photosynthesis come from?

In the model, oxygen comes from water that is split in the first stage.

Why is the two-stage photosynthesis model useful?

It helps us see that light is used to split water, and that oxygen comes from water, while glucose is made later from hydrogen and carbon dioxide.