What Happens During Light Reactions

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What Happens During Light Reactions?

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.

What is happening in the light reactions of photosynthesis?

During the light-dependent stage (“light” reactions) chlorophyll absorbs light energy which excites some electrons in the pigment molecules to higher energy levels these leave the chlorophyll and pass along a series of molecules generating formation of NADPH (an enzyme) and high-energy ATP molecules.

What happens in the light reactions of photosynthesis quizlet?

(In the light reactions the energy of sunlight is used to oxidize water (the electron donor) to O2 and pass these electrons to NADP+ producing NADPH. Some light energy is used to convert ADP to ATP. The NADPH and ATP produced are subsequently used to power the sugar-producing Calvin cycle.)

What happens during light reaction Mcq?

During the light reaction water is oxidized using energy from light and reduced NADPH₂ and ATP are synthesized. The oxidation of water is called photolysis. Oxygen is released as a by-product during the photolysis of water. The NADPH₂ and ATP are used subsequently to reduce carbon dioxide into sugars.

What is produced during the light reaction quizlet?

In the light reactions the energy of sunlight is used to oxidize water (the electron donor) to O2 and pass these electrons to NADP+ producing NADPH. Some light energy is used to convert ADP to ATP. The NADPH and ATP produced are subsequently used to power the sugar-producing Calvin cycle.

What three reactions occur during the light reactions in photosynthesis?

Figure 1. Light reactions harness energy from the sun to produce chemical bonds ATP and NADPH. These energy-carrying molecules are made in the stroma where carbon fixation takes place. The light-independent reactions of the Calvin cycle can be organized into three basic stages: fixation reduction and regeneration.

What three events occur during the light reactions of photosynthesis quizlet?

photosynthesis. The correct sequence of events in the light reactions is… absorption of sunlight splitting of water electrons flow down the electron transport chain and ATP is made.

What is the light reaction quizlet?

light reactions. the initial reactions in photosynthesis which are triggered by the absorption of light by photosystems I and II and include the passage of electrons along the electron transport chains the. > makes NADPH oxygen gas and ATP. chloroplast.

Where do light reactions occur Mcq?

This is a biogeochemical process in which light energy is converted into chemical energy. Photosynthesis takes place in the chloroplast.
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Where does the light reaction take place?

thylakoid discs
The light reaction takes place in the thylakoid discs. There water (H20) is oxidized and oxygen (O2) is released. The electrons freed up from water are transfered to ATP and NADPH.Aug 21 2014

What is the photosynthesis equation?

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.

What is the function of light in the light reaction?

The Light Reactions of Photosynthesis. Light is absorbed and the energy is used to drive electrons from water to generate NADPH and to drive protons across a membrane. These protons return through ATP synthase to make ATP.

What happens during Calvin cycle?

The Calvin cycle is a process that plants and algae use to turn carbon dioxide from the air into sugar the food autotrophs need to grow. … The Calvin cycle has four main steps: carbon fixation reduction phase carbohydrate formation and regeneration phase.

What are the inputs of light reaction?

1. For each of the two main stages of photosynthesis identify the inputs. Inputs of the light reactions are light and water and ADP P and NADP⁺ from the Calvin cycle. Inputs of the Calvin cycle are CO₂ and ATP and NADPH from the light reactions.

What happens during the light-independent reactions?

The light-independent reactions of photosynthesis take place within the stroma. It contains enzymes that work with ATP and NADPH to “fix” carbon from carbon dioxide into molecules that can be used to build glucose. The chloroplast’s own genetic material (separate from that of the cell) is also stored in the stroma.

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Which of the following events occur during light-dependent reactions?

In light-dependent reactions the energy from sunlight is absorbed by chlorophyll and converted into chemical energy in the form of electron carrier molecules like ATP and NADPH. Light energy is harnessed in Photosystems I and II both of which are present in the thylakoid membranes of chloroplasts.

Which of the following occurs during the light-dependent reactions?

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 happens during 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.

What happens during the light-dependent reactions quizlet?

The light-dependent reactions produce oxygen gas and convert ADP and NADP+ into the carriers ATP and NADPH. ATP and NADPH provide the energy needed to build high-energy sugars from low-energy carbon dioxide.

How do light reactions produce ATP?

In the light-dependent reactions energy absorbed by sunlight is stored by two types of energy-carrier molecules: ATP and NADPH. … The energy generated by the hydrogen ion stream allows ATP synthase to attach a third phosphate to ADP which forms a molecule of ATP in a process called photophosphorylation.

What is the definition of light reaction in biology?

: the phase of photosynthesis that requires the presence of light and that involves photophosphorylation.

What is actually produced during the light reaction do you know the chemical equation?

Specifically plants use energy from sunlight to react carbon dioxide and water to produce sugar (glucose) and oxygen. Many reactions occur but the overall chemical reaction for photosynthesis is: 6 CO₂ + 6 H₂O + light → C₆H₁₂O₆ + 6 O. Carbon Dioxide + Water + Light yields Glucose + Oxygen.

What type of reaction takes place in Sun Mcq?

What type of Reaction takes place in sun? Explanation: Nuclear fusion reaction takes place in sun as well as stars. The process is carried by proton-proton chain. The sun starts with protons and through a series of steps turns them into helium.

What are the end products of light reaction and dark reaction?

Complete Step by Step Answer:

Light Reaction	Dark Reaction
ATP and NADPH are the end products of this reaction.	The end products of light reaction i.e. ATP and NADPH are used here to form glucose as the end product.
This reaction causes the water molecule to split into hydrogen and oxygen.	There is no splitting of water.

What is the reaction responsible for the production of light energy from the sun Mcq?

What is the reaction responsible for the production of light energy from the sun? Explanation: At very high temperatures in the interior of the sun protons fuse to form helium nuclei liberating a huge amount of energy. Therefore the reaction responsible for the production of light energy from the sun is fusion. 3.

Where does light reaction takes place in chlorophyll?

the chloroplast thylakoids

In plants the so-called “light” reactions occur within the chloroplast thylakoids where the aforementioned chlorophyll pigments reside. When light energy reaches the pigment molecules it energizes the electrons within them and these electrons are shunted to an electron transport chain in the thylakoid membrane.

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How do you explain photosynthesis to a child?

How does photosynthesis work step by step?

The two stages of photosynthesis: Photosynthesis takes place in two stages: light-dependent reactions and the Calvin cycle (light-independent reactions). Light-dependent reactions which take place in the thylakoid membrane use light energy to make ATP and NADPH.

What do stomata do?

This evolutionary innovation is so central to plant identity that nearly all land plants use the same pores — called stomata — to take in carbon dioxide and release oxygen. Stomata are tiny microscopic and critical for photosynthesis. Thousands of them dot on the surface of the plants.

What is one of the main functions of light reactions?

The main function of light-dependent reactions of photosynthesis is to produce ATP molecules through oxidation-reduction reactions and chemiosmosis reactions in chloroplasts.

What does the Calvin reaction need from the light reactions?

The light dependent reaction of photosynthesis provides two important requirements ATP and NADPH to the Calvin Cycle. ATP-It is a energy rich compound. The light energy is stored in it.

How does the Calvin cycle make sugars?

The Calvin Cycle uses the NADPH and ATP from the Light Reactions to “fix” carbon and produce glucose. Carbon dioxide enters the Calvin Cycle when Rubisco attaches it to a 5-carbon sugar.

What happens during the Calvin cycle quizlet?

In the Calvin cycle carbon dioxide is incorporated into organic compounds a process called carbon fixation. … In the light reactions energy is absorbed from sunlight and converted into a chemical energy in the Calvin cycle carbon dioxide and chemical energy are used to form organic compounds.

Which of the following is produced during light phase of photosynthesis?

Light reactions need light to produce organic energy molecules. They are initiated by colored pigments mainly green colored chlorophylls. Light reaction occurs inside thylakoids. The function of this phase is to produce NADPH and energy-rich ATP molecules.