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2021-05-14

How do light dependent and light-independent reactions transform light energy into stored chemical energy?

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How do light dependent and light-independent reactions transform light energy into stored chemical energy?

In thelight-dependent reactions, energy from sunlight is absorbed by chlorophyll and that energy is converted into stored chemical energy. In the light-independent reactions, the chemical energy harvested during the light-dependent reactions drive the assembly of sugar molecules from carbon dioxide.

How does Photosynthesis transforms light energy into stored chemical energy?

The process of photosynthesis converts light energy to stored chemical energy by converting carbon dioxide plus water into sugars plus released oxygen.

How does light dependent reactions relate to light-independent reactions and the Calvin cycle?

In the light-independent reactions or Calvin cycle, the energized electrons from the light-dependent reactions provide the energy to form carbohydrates from carbon dioxide molecules. After the energy is transferred, the energy carrier molecules return to the light-dependent reactions to obtain more energized electrons.

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How does the light energy captured in the light dependent reactions help in the synthesis of glucose and other carbohydrates in the Calvin cycle?

The overall purpose of the light-dependent reactions is to convert light energy into chemical energy. This chemical energy will be used by the Calvin cycle to fuel the assembly of sugar molecules. To replace the electron in the chlorophyll, a molecule of water is split.

What are the 7 steps of light dependent reactions?

Terms in this set (7)

  • (1st Time) Energy is absorbed from the sun.
  • Water is broken down.
  • Hydrogen ions are transported across the thylakoid membrane.
  • (2nd Time) Energy is absorbed from the sun.
  • NADPH is produced from NADP+.
  • Hydrogen ions diffuse through the protein channel.
  • ADP becomes ATP.

What is the process of light independent reaction?

In photosynthesis, a light-independent reaction takes place in plant chloroplasts. In this process, sugars are made from carbon dioxide. The process, known as the Calvin cycle, uses products of the light-dependent reactions (ATP and NADPH) and various enzymes. This takes place in the grana region of the chloroplast.

What is an example of a light dependent reaction?

Understand Light Dependent Reactions : Example Question #10 Light dependent reactions convert solar energy to chemical energy (in the form of ATP and NADPH). Sunlight and H2O are the reactant of the light dependent reaction. The sunlight is captured by photosystem II, and is used to excite electrons.

What is present in both the light dependent and light independent reactions?

In the light-dependent reactions, energy from sunlight is absorbed by chlorophyll and that energy is converted into stored chemical energy. In the light-independent reactions, the chemical energy harvested during the light-dependent reactions drives the assembly of sugar molecules from carbon dioxide.

What are the materials needed for the light independent reactions?

In photosynthesis, chlorophyll, water, and carbon dioxide are reactants. GA3P and oxygen are products. In photosynthesis, water, carbon dioxide, ATP, and NADPH are reactants. RuBP and oxygen are products.

What are the products of light dependent reactions Why are they important in light independent?

1: The light-dependent reactions of photosynthesis (left) convert light energy into chemical energy, forming ATP and NADPH. These products are used by the light-independent reactions to fix CO2, producing organic carbon molecules.

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What are light independent reactions called?

Other names for light-independent reactions include the Calvin cycle, the Calvin-Benson cycle, and dark reactions. Light Reactions: Light-dependent reactions harness energy from the sun to produce chemical bonds, ATP, and NADPH. These energy-carrying molecules are made in the stroma where the Calvin cycle takes place.

What are the end products of light independent reaction?

There are two end products of the light reaction of photosynthesis, ATP and NADPH. These molecules are produced during the cyclic and the non-cyclic photophosphorylation reactions. These are the products which are used in the dark reactions.

Does light-independent reaction produce oxygen?

In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water. The light-dependent reactions release oxygen as a byproduct as water is broken apart.

What are the end products of light phase?

Difference between Light and Dark Reaction

Light Reaction Dark Reaction
The end products are ATP and NADPH. Glucose is the end product. ATP and NADPH help in the formation of glucose.
The water molecules split into hydrogen and oxygen. Glucose is produced. Co2 is utilized in the dark reaction.

What is the main source of energy of the light-dependent reaction?

Light-dependent reactions happen in the thylakoid membrane of the chloroplasts and occur in the presence of sunlight. The sunlight is converted to chemical energy during these reactions. The chlorophyll in the plants absorb sunlight and transfers to the photosystem which are responsible for photosynthesis.

Can the dark reaction occur in light?

The Calvin cycle forms part of the dark reactions. As long as ATP is available, the dark reactions can occur in darkness or in light. Compare light reaction. See more at Calvin cycle photosynthesis.

Why is it important in photosynthesis that there is a light and dark reaction?

What is the importance of the light and dark reactions in photosynthesis? During the light reactions of photosynthesis, light energy from the sun is captured and used to make ATP and NADPH. During the dark reactions, ATP, NADPH, and carbon dioxide combine to make glucose and other compounds.

Where do light independent reactions occur?

The inside of the thylakoid membrane is called the lumen, and outside the thylakoid membrane is the stroma, where the light-independent reactions take place. The thylakoid membrane contains some integral membrane protein complexes that catalyze the light reactions.

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Do dark or light independent reactions occur in plants during the daytime?

But all eukaryotes, including plants, carry out cellular respiration. Many students believe that the light-dependent reactions occur in the daytime and the light-independent reactions (sometimes called the “dark” reactions) occur at night when the plant can’t get sunlight, so it needs sugar.

What are the requirements of light independent reactions where do light independent reactions occur?

Requirement of light independent reaction is carbon dioxide, NADPH and ATP. The site of light independent reaction is stroma of the chloroplast. Explanation: Light independent reaction occurs in the absence of light.

What is the relationship between photosynthesis and light intensity?

So in the case of a plant, a higher light intensity means more packets of light called “photons” are hitting the leaves. As you rise from low light intensity to higher light intensity, the rate of photosynthesis will increase because there is more light available to drive the reactions of photosynthesis.

What is the importance of light reactions in photosynthesis?

The overall purpose of the light-dependent reactions is to convert light energy into chemical energy. This chemical energy will be used by the Calvin cycle to fuel the assembly of sugar molecules. The light-dependent reactions begin in a grouping of pigment molecules and proteins called a photosystem.

What is the relationship between photosynthesis and co2?

During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. These sugar molecules are the basis for more complex molecules made by the photosynthetic cell, such as glucose.

How does temperature and light intensity affect photosynthesis?

As light intensity increases, the rate of photosynthesis will increase as long as other factors are in adequate supply. If carbon dioxide and light levels are high, but temperature is low, increasing temperature will have the greatest effect on reaching a higher rate of photosynthesis.

How does light intensity affect oxygen production?

As the light levels are increased there is an increase in oxygen (bubble) production from photosynthesis of the plant. This increase slows down progressively at higher light levels.