What Are Light Dependent Reactions

The light reaction is the initial stage of photosynthesis which traps light energy to produce ATP and NADPH whereas dark reaction is the second step of photosynthesis which utilizes the energy from ATP and NADPH to produce glucose.

Who discovered light reactions?

Robin hill discovered light Reactions commonly known as hill reactions. Robin hill discovered light Reaction in 1937. he discovered Reaction in the chloroplast.

What is the other name for the light reaction?

Explanation: The other name of light reaction is photoreaction.

What are the two types of light reactions?

Two types of reaction centers exist generally called Photosystem I (PSI) and Photosystem II (PSII).

What are the major events of light reactions?

Answer: The important events of light reaction are (i) the Excitation of chlorophyll molecule to emit a pair of electrons and the use of their energy in the formation of ATP from ADP + Pi. This process is called photophosphorylation. Splitting of a water molecule (a) (b) End products of the light reaction are NADPH and ATP.

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Where do light-independent reactions occur?

The light-independent reactions represent the known Calvin–Benson–Bassham (CBB) cycle which takes place in the stroma of chloroplasts and is the primary pathway of carbon fixation of C3 plants [119]. The CBB cycle proceeds in three main stages: carboxylation reduction and regeneration.

What is the light-dependent reaction of raw materials?

Explanation: The light-dependent reaction uses water and light. Light provides the energy needed to break apart water molecules. This process will make oxygen and hydrogen ions.

Why should the light-dependent reaction occur before the light-independent reaction?

In light-dependent Photosynthesis, the photosynthetic pigment absorbs the light energy and converts it into chemical energy ATP and NADPH2. … So the light-dependent reaction should occur before the light-independent reaction.

Which of the following best describes light reaction?

Hence option c correctly describes the light reaction in which plants utilize light energy and synthesize the assimilatory powers ATP and NADPH. Water plays a major role in light reactions. The splitting of water releases electrons protons and oxygen. The electrons are accepted by the reaction center of PS-II.

What are NADPH and ATP?

ATP is a versatile energy currency for cells while NADPH is a source of electrons that can pass along to an electron acceptor. The function of ATP is that it acts as major energy storing and transferring molecule. On the other hand, NADPH works as a coenzyme and reduces the power of biochemical reactions.

Is ATP A synthase?

The ATP synthase is a mitochondrial enzyme localized in the inner membrane where it catalyzes the synthesis of ATP from ADP and phosphate driven by a flux of protons across a gradient generated by electron transfer from the proton chemically positive to the negative side.

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What is the difference between ADP and ATP and NADP+ and NADPH?

What is the difference between NADP+ NADPH ADP and ATP? … The NADPH is a full carried NADP+ is the empty carrier ADP is a used energy molecule ATp is the full molecule. ATP turns into ADP+P b breaking the bonds.

Is Oxygen light dependent or independent?

Explanation: Oxygen is in fact a by-product of light-dependent reactions of photosynthesis.

What is the main purpose of light-dependent reactions?

The overall function of light-dependent reactions in the first stage of photosynthesis is to convert solar energy into chemical energy in the form of NADPH and ATP which are used in light-independent reactions and fuel the assembly of sugar molecules.

A conceptual overview of light-dependent reactions

The Light Reactions of Photosynthesis

Photosynthesis – Light-dependent Stage – Post 16 Biology (A Level Pre-U IB AP Bio)

Photosynthesis – Light Dependent Reactions and the Calvin Cycle

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