What Is The First Stage Of Photosynthesis Called – Boost your A Level Biology Performance A Level Biology Online Course Over 100 instructional videos, flashcards and weekly workshops Learn more

Light-dependent reactions are the first stage of photosynthesis and take place in the thylakoid membrane of the chloroplast.

What Is The First Stage Of Photosynthesis Called

Reduced NADP is the source of H+ for the light-independent phase, while ATP is the source of energy.

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Light-independent reactions are the second and final stages of photosynthesis that take place in the stroma of the chloroplast. The light-independent reactions are collectively known as the Calvin cycle and use ATP and reduce NADP from the light-dependent phase to produce glucose.

Light-dependent reactions take place in the thylakoid membrane of the chloroplast and involve the absorption of light energy by photosynthetic pigments, such as chlorophyll. This energy is then used to produce ATP and NADPH, which power light-independent reactions.

Light-independent reactions take place in the stroma of the chloroplast and involve the use of energy from ATP and NADPH produced in light-dependent reactions. Carbon dioxide is fixed into glucose through a process called the Calvin cycle.

Photosynthesis has two stages because it involves two distinct sets of reactions that occur in different parts of the chloroplast in plant cells.

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The first step of photosynthesis is called the light-dependent reaction, which occurs in the thylakoid membrane of the chloroplast. In these reactions, light energy is absorbed by chlorophyll and other pigments and converted into chemical energy in the form of ATP and NADPH. Water molecules also split during this stage, releasing oxygen gas as a byproduct.

The second stage of photosynthesis is called the light-independent reaction or the Calvin cycle. These reactions occur in the stroma of the chloroplast and do not directly require light energy. Instead, ATP and NADPH produced in light-dependent reactions are used to power the synthesis of carbohydrates from carbon dioxide in the air. This process is also known as carbon fixation.

By having 2 stages of photosynthesis, it can effectively convert light energy into chemical energy and use that energy to power the synthesis of organic molecules from carbon dioxide. Light-dependent reactions capture energy from sunlight and convert it to chemical energy, while light-independent reactions use that energy to create organic molecules that can can be used for growth, repair and energy storage in plants.

→How does photosynthesis help regulate oxygen and carbon dioxide levels in the atmosphere?

Light Independent Reaction

Photosynthesis removes carbon dioxide from the atmosphere and produces oxygen as a byproduct. This helps regulate the levels of these gases in the atmosphere, which is important for maintaining the balance that supports life on Earth.

→How do changes in the environment, such as increased carbon dioxide, affect photosynthesis?

An increase in carbon dioxide concentration can increase the rate of photosynthesis in plants. This is because light-independent photosynthetic reactions require carbon dioxide as a starting material, so increasing its availability can lead to increased rates of glucose production. However, too much carbon dioxide can also have negative effects on plants and the overall ecosystem.

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