What Does Light Dependent Mean


What does the term light dependent mean?

Light-dependent Reactions Definition

Those reactions which occur in the presence of light (photons) are known as light-dependent reactions. … The molecules of chlorophyll actively take part in the reaction. They transfer sunlight (solar energy) into potential energy and store it as chemical energy in sugars.

What is light dependent reaction answer?

The light-dependent reaction is a photochemical reaction taking place in the thylakoid membranes of chloroplasts where light energy is transformed into adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide phosphate (NADPH).

What are light dependent products?

The products of the light-dependent reactions ATP and NADPH have lifespans in the range of millionths of seconds whereas the products of the light-independent reactions (carbohydrates and other forms of reduced carbon) can survive for hundreds of millions of years.

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What goes in light dependent reaction?

In the light-dependent reactions energy absorbed by sunlight is stored by two types of energy-carrier molecules: ATP and NADPH. The energy that these molecules carry is stored in a bond that holds a single atom to the molecule. For ATP it is a phosphate atom and for NADPH it is a hydrogen atom.

How does the light-dependent reaction work?

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.

Why is light-dependent reaction important?

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 energy culminates in a molecule of chlorophyll found in the reaction center.

What happens in PSII?

PSII is the multisubunit chloroplast membrane-associated pigment–protein complex that uses the energy of sunlight to drive the oxidation of water evolving oxygen donating electrons into the photosynthetic electron transfer chain and depositing protons into the thylakoid lumen.

What is the difference between 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 is light reaction explain?

“Light reaction is the process of photosynthesis that converts energy from the sun into chemical energy in the form of NADPH and ATP.”

What are the three products of the light dependent reaction?

CO2​ H2​O and NADPH.

What are the 3 reactants of the light dependent reaction?

The reactants in the light-dependent chemical reaction are adenosine diphosphate (ADP) oxydized nicotinamide adenine dinucleotide phosphate (NADP+) and the hydrogen in water.

Does light dependent produce ADP?

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.

Is Calvin cycle light dependent?

These energy-carrying molecules are made in the stroma where the Calvin cycle takes place. The Calvin cycle is not totally independent of light since it relies on ATP and NADH which are products of the light-dependent reactions.

What goes light independent?

The light independent process (also called dark reactions or the Calvin-Benson cycle) takes place in the stroma of the chloroplast. Carbon dioxide is modified by series of chemical reactions to form carbohydrates. The energy for these reactions comes from ATP and NADPH generated during the light dependent process.

What are the steps of light-independent reactions?

The light-independent reactions of the Calvin cycle can be organized into three basic stages: fixation reduction and regeneration.

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Which best describes light-independent reactions?

Which best describes light-independent reactions? They are the first stage of photosynthesis. They utilize the energy stored in ATP and NADPH. They use carbon dioxide to synthesize proteins.

Does PSII make ATP?

In a process called non-cyclic photophosphorylation (the “standard” form of the light-dependent reactions) electrons are removed from water and passed through PSII and PSI before ending up in NADPH. This process requires light to be absorbed twice once in each photosystem and it makes ATP .

In what way are the light dependent and light-independent reactions of photosynthesis similar?

The light-dependent reactions produce ATP and NADPH which are then used by the light-independent reactions. The light-dependent reactions produce ATP and NADPH which are then used by the light-independent reactions.

What happens when light hits photosystem 2?

A photon strikes photosystem II to initiate photosynthesis. … The ions flow through ATP synthase from the thylakoid space into the stroma in a process called chemiosmosis to form molecules of ATP which are used for the formation of sugar molecules in the second stage of photosynthesis.

What is the difference between light-dependent?

During light-dependent photosynthesis photolysis or splitting of molecules of water take place into hydrogen and oxygen. During light-independent photosynthesis reduction of carbon dioxide into glucose molecules take place through a series of reactions constituting the Calvin cycle.

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

In light – dependent photosynthesis the photosynthetic pigment absorbs the light energy and convert it into chemical energy ATP and NADPH2 . … So the light-dependent reaction should occur before the light-independent reaction.

What is light reaction with example?

The series of biochemical reactions in photosynthesis that require light energy that is captured by light-absorbing pigments (such as chlorophyll) to be converted into chemical energy in the form of ATP and NADPH. Synonym: light-dependent reaction.

What is required for both the light dependent and light independent reactions to proceed?

Light dependent reactions occur in Grana of Chloroplasts Light Independent reactions occur in Stroma of Chloroplasts. Hence Chloroplasts are required for both the light-dependent and light-independent reactions to proceed. Elaine C. The answer is energy.

What is the other name for light reaction?

Explanation: The other name of light reaction is photo reaction.

Are two energy packets produced during the light dependent reaction?

Two high-energy molecules that are produced during the light reactions are adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide phosphate (NADP-H). These two molecules temporarily store energy they transfer energy into carbohydrates being produced during the light independent reactions (= Calvin cycle).

How are the light dependent and independent phases linked?

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.

What are the raw materials needed in the light independent reaction?

Answer: Raw materials are Carbon dioxide and water light reaction happens in plants.

What are the 3 stages of Calvin cycle?

Reactions of the Calvin cycle

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The Calvin cycle reactions can be divided into three main stages: carbon fixation reduction and regeneration of the starting molecule.

Which statement is true the Calvin cycle is the light dependent?

The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane. The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the stroma.

What compounds absorb light energy the best?

What compound is best able to absorb the light energy from the sun and convert it into chemical energy? Chlorophyll – absorbs light and releases an electron.

Is Oxygen light dependent or independent?

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

What is meant by light-independent reactions?

Light-independent reaction is a series of biochemical reactions in photosynthesis not requiring light to proceed and ultimately produce organic molecules from carbon dioxide. The energy released from ATP (produced during the light reactions) drives this metabolic pathway.

Which of the following best describes light reaction?

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

How do the processes of light dependent and light independent reactions help the cell conserve energy and matter?

These molecules are then used to produce the carbohydrate molecules when light is not available. This alternation helps in the conservation of the energy as the plant can consume sufficient light energy and then produce the carbohydrate molecule when this energy cannot be harvested from the environment.

Conceptual overview of light dependent reactions

What is an LDR? (Light Dependant Resistor) – Electronics Basics 26

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

The Light Reactions of Photosynthesis

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