Where Does The Light Dependent Reaction Take Place

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Where Does The Light Dependent Reaction Take Place?


Where do the light reaction take place in the chloroplast?

The chloroplast is involved in both stages of photosynthesis. The light reactions take place in the thylakoid. There water (H2O) is oxidized and oxygen (O2) is released. The electrons that freed from the water are transferred to ATP and NADPH.

How does light-dependent reaction happen?

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 lower energy form NADP+ picks up a high energy electron and a proton and is converted to NADPH.

Where do light-dependent reactions occur Brainly?

Explanation: Light-dependent reactions which take place in the thylakoid membrane use light energy to make ATP and NADPH. The Calvin cycle which takes place in the stroma uses energy derived from these compounds to make GA3P from CO2.

Where do the light-dependent reaction and the Calvin cycle occurs in the chloroplast?

Light-dependent reaction takes place in the presence of light energy in thylakoid membranes (grana) of the chloroplast Calvin cycle occurs at the stroma of the chloroplast.

Where does the light reaction takes place Class 10?

The light reaction is also known as photolysis reaction and takes place in the presence of light. It usually takes place in the grana of chloroplasts.

Where does the light reaction of photosynthesis take place quizlet?

– The light reactions take place inside the thylakoids of chloroplasts. – The light reactions produce chemical energy in the form of NADPH and ATP.

Where do the light-independent reactions take place in CAM photosynthesis?


In plants carbon dioxide (CO2) enters the leaves through stomata where it diffuses over short distances through intercellular spaces until it reaches the mesophyll cells. Once in the mesophyll cells CO2 diffuses into the stroma of the chloroplast the site of light-independent reactions of photosynthesis.

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Where does Calvin cycle take place?

Overview of the Calvin cycle This process is fueled by and dependent on ATP and NADPH from the light reactions. Unlike the light reactions which take place in the thylakoid membrane the reactions of the Calvin cycle take place in the stroma (the inner space of chloroplasts).

Which events take place in light-dependent reactions of photosynthesis?

The light-dependent reactions release oxygen as a byproduct as water is broken apart. In the Calvin cycle which takes place in the stroma the chemical energy derived from the light-dependent reactions drives both the capture of carbon in carbon dioxide molecules and the subsequent assembly of sugar molecules.

What are the actual reaction centers of the light-dependent reactions?

The reaction center. The reaction center is in the thylakoid membrane. It transfers light energy to a dimer of chlorophyll pigment molecules near the periplasmic (or thylakoid lumen) side of the membrane. This dimer is called a special pair because of its fundamental role in photosynthesis.

What happens to a pigment molecule in the presence of visible light?

When a light is shone on the extract pigment molecules absorb energy. Because the pigments have been isolated from the thylakoid membranes of the chloroplasts the energy cannot be used for photosynthesis. Instead the energy is released as heat and light in a process called fluorescence.

What reaction takes place during photosynthesis?

The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the reactants six carbon dioxide molecules and six water molecules are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules the products.

Is the Calvin cycle light-dependent?

The Calvin cycle refers to the light-independent reactions in photosynthesis that take place in three key steps. Although the Calvin Cycle is not directly dependent on light it is indirectly dependent on light since the necessary energy carriers (ATP and NADPH) are products of light-dependent reactions.

Where does Calvin cycle takes place in chloroplast describe the three phases of Calvin cycle?

enters to the stroma of chloroplast it is place where light independent reactions takes place and it contains various enzymes which are useful for the cycle. 3. This Calvin cycle mainly occurs in 3 steps such as Fixation Reduction and regeneration.

Where does light reaction take place Class 11?


Light reaction of photosynthesis takes place in the thylakoids of the chloroplasts. During this process the water molecule is splitted into oxygen protons and electrons. These protons and electrons are then transferred through the thylakoid membrane to produce energy storage molecules i.e. ATP and NADPH. >

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Where does light reaction takes place grana stroma stroma?

The light reaction takes place in thylakoid or grana and stroma lamellae. The light-dependent reactions take place in the thylakoid membranes in the granum (stack of thylakoids) within the chloroplast.

Where in the chloroplast do the light-dependent reactions take place quizlet?

The light-dependent reactions take place on the thylakoid membranes (the light is absorbed by the chlorophyll that is embedded in these membranes). The light-independent reactions (also called the Calvin Cycle or the dark reactions) take place in the stroma. The stroma is the fluid that fills the chloroplast.

Where do the light reactions occur in plant cells quizlet?

1) The light reactions occur in the thylakoid membrane. 2) The inputs to the light reaction is water and light.

Where in the chloroplast do the light reactions take place quizlet?

Within the chloroplast the light reactions take place in the flattened sacs called thylakoids and the Calvin cycle takes place in the thick fluid called the stroma.

What are the light-dependent and light-independent reactions of photosynthesis?

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.

Does the light-independent reaction occur in the dark?

There are three phases to the light-independent reactions collectively called the Calvin cycle: carboxylation reduction reactions and ribulose 1 5-bisphosphate (RuBP) regeneration. Though it is called the “dark reaction” the Calvin cycle does not actually occur in the dark or during night time.

Where do CAM plants store co2?

CAM plants have a different leaf anatomy from C3 plants and fix the CO2 at night when their stomata are open. CAM plants store the CO2 mostly in the form of malic acid via carboxylation of phosphoenolpyruvate to oxaloacetate which is then reduced to malate.

Where does the Calvin cycle take place quizlet?

Where does the Calvin Cycle occur? The Calvin Cycle occurs in the stroma whereas the light reactions occur in the thylakoids.

What are the inputs to the Calvin cycle where do they come from?

The products of the Calvin cycle are 6 PGAL molecules. One of the PGAL molecules is used to create glucose. The other five are used to regenerate 3 RuBP molecules. What are three uses of glucose in a plant?

Where do respiration and cellular respiration takes place?

While most aerobic respiration (with oxygen) takes place in the cell’s mitochondria and anaerobic respiration (without oxygen) takes place within the cell’s cytoplasm.Feb 12 2020

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Which process is part of the Light Reaction?

The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants the light reactions take place in the thylakoid membranes of organelles called chloroplasts.

Which process occurs during the light-dependent reaction of photosynthesis quizlet?

Which process occurs during the light-dependent reactions in photosynthesis? Water molecules are split. … ATP and NADPH are produced in the light-dependent reactions and used in the light-independent reactions.

Where does the dark reaction take place?


Dark reactions of photosynthesis are the chemical reactions that convert carbon dioxide and other compounds into glucose. These reactions occur in the stroma. Stroma is a fluid filled area of a chloroplast outside the thylakoid membrane.

Where does water in the light-dependent reaction come from?

The light-dependent reactions begin in photosystem II. In PSII energy from sunlight is used to split water which releases two electrons two hydrogen atoms and one oxygen atom.

Where are the pigment molecules located?

Pigment molecules are held in place by the photosystems which are protein complexes. The position of the pigments is essential for an efficient transfer of the excitation energy.

What is the main purpose of light-dependent reactions of photosynthesis?

The goal of the light-dependent reactions of photosynthesis is to collect energy from the sun and break down water molecules to produce ATP and NADPH. These two energy-storing molecules are then used in the light-independent reactions. Within chloroplasts chlorophyll is the pigment that absorbs sunlight.

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 reaction takes place during photosynthesis Mcq?

Therefore Photosynthesis is an Oxidation-Reduction reaction which takes place in two steps light reaction and dark reaction. With the help of Question and Answers we have tried to cover the whole process and also we come to know how light energy is converted into chemical energy.

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