explain why water is essential for the light reactions


Explain Why Water Is Essential For The Light Reactions?

During the process of photosynthesis, six molecules of carbon dioxide and six molecules of water react in the presence of sunlight to form one glucose molecule and six molecules of oxygen. The role of water is to release oxygen (O) from the water molecule into the atmosphere in the form of oxygen gas (O2).Mar 13, 2018

Why is water essential for the light reactions?

Water is essential for Light DEPENDANT reactions, because the plant needs the hydrogen ions from the H20 to perform photosynthesis.

Why is water required for the light reactions of photosynthesis quizlet?

-Water is important for photosynthesis because it the source of hydrogen for the sugars created through photosynthesis. Why is oxygen produced during the light reactions? -Turns out that the light energy is used to split the water molecule, which produces H+ & O- ions.

What is the purpose of water in photosynthesis?

Explanation: Water is one of the reactants in photosynthesis, it provides the hydrogen needed to form glucose (a hydrocarbon). Water and carbon dioxide enter the leaf through the stomata (small holes on the underside of the leaf that are controlled by gaurd cells) by diffusion.

What is the role of water in reactions?

Water can contribute to the changes in the free energy of activation through solute-solvent interactions and solvent reorganization. Water can also influence reactions through phase behavior, solute-solvent collisions, diffusion limitations, and cage effects.

Why are 12 molecules of water required for the light reactions?

–Two molecules of water split to form1 molecule of oxygen and the respective number of electrons and hydrogen ions are also formed . –Now for producing 12 molecules of NADPH , total 12 molecules of water are required.

What is are required for in the light reaction of photosynthesis?

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. … The photosystems and electron transport chain components are embedded in the thylakoid membrane.

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Why do water molecules split in photosynthesis?

Water is absolute requirement for photosynthesis to occur. During Light reactions of Photosynthesis, the chlorophyll will be activated by light. … Water molecule is split to release H+ ions and also oxygen.

Why does the light reactions need the Calvin cycle?

The light dependent reaction of photosynthesis provides two important requirements ATP and NADPH to the Calvin Cycle. … The light energy is stored in it. It provides the energy for the formation of energy rich chemical bonds in glucose. Finally, it changed into ADP.

What is the essential role of water molecules in the reactions of photosynthesis?

During the process of photosynthesis, six molecules of carbon dioxide and six molecules of water react in the presence of sunlight to form one glucose molecule and six molecules of oxygen. The role of water is to release oxygen (O) from the water molecule into the atmosphere in the form of oxygen gas (O2).

What happens to water molecules in the light reactions?

9. What happens to water molecules in the light reactions? Water molecules (H2O) are split to give electrons, H+ ions, and oxygen gas (O2) . … In the Calvin cycle, carbon dioxide molecules (CO2) are combined with each other and with the electrons and Hydrogen ions from NADPH to form glucose (C6H12O6).

What is the role of photolysis of water in light reaction of photosynthesis?

This part of photosynthesis occurs in the granum of a chloroplast where light is absorbed by chlorophyll; a type of photosynthetic pigment that converts the light to chemical energy. This reacts with water (H2O) and splits the oxygen and hydrogen molecules apart.

Why is water essential for our life?

Water’s extensive capability to dissolve a variety of molecules has earned it the designation of “universal solvent,” and it is this ability that makes water such an invaluable life-sustaining force. On a biological level, water’s role as a solvent helps cells transport and use substances like oxygen or nutrients.

Why is the water essential for life class 9?

Organisms need water for the following activities: (1) All cellular processes occur due to water. (2) Transportation of substances in our body takes place by dissolving in water. (3) Terrestrial animals require fresh water for transportation of minerals and for getting rid of waste from their body.

Why is it essential to life that water has a high heat capacity?

Finally, the high specific heat of water makes it resistant to temperature change, allowing life forms to maintain relatively constant internal temperatures. The high specific heat and surface tension of water contribute to its high boiling point, helping to keep it in liquid form for most biological processes.

How many water molecules should be directly involved in photosynthesis to form one glucose?

Overall equation for photosynthesis

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For each molecule of glucose produced: 6 water water molecules are oxidized, and become the source of electrons for carbon dioxide reduction. 6 molecules of carbon dioxide are required, one for each carbon atom in glucose.

Where does light reaction take place?

the chloroplast
The light reaction occurs in the thylakoids of the chloroplast. When the light hits, chlorophyll a get excited to higher energy state followed by a series of reactions. This energy is converted into energy molecules ATP and NADPH by using PS I and PS II.

Where does photosynthesis take place?

In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.

Is light required in light reaction?

The energy of light captured by pigment molecules, called chlorophylls, in chloroplasts is used to generate high-energy electrons with great reducing potential. These electrons are used to produce NADPH as well as ATP in a series of reactions called the light reactions because they require light.

Do light reactions require visible light?

The light dependent reaction of photosynthesis requires energy in the form of light so as to convert CO2 and H2O into glucose and other substrates. The light independent reaction does not require light but can also occur in the presence of light.

How is water produced in photosynthesis?

Water is also a product of photosynthesis. This water is produced from the oxygen atoms in the carbon dioxide molecules. The oxygen molecules released into the atmosphere come exclusively from the original water molecules, not from the carbon dioxide molecules.

Which is essential for water splitting in photosynthesis?

Manganese (Mn) is an essential micronutrient that while needed in small amounts, plays a key role in photosynthesis. Mn sparks the photosynthesis process by splitting water after Photosytem II (PSII) fixes light to initiate the conversion of CO2 and water into carbohydrates.

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Why is water split during the light-dependent reactions quizlet?

The oxygen released during photosynthesis comes from the splitting of water during the light-dependent reaction. 3. Remember, the electrons lost from the reaction center in photosystem II must be replaced. The splitting of water serves to replace these lost electrons.

Why or how does water split into hydrogen and oxygen in presence of light?

The chlorophyll’s donated electrons need to be replaced, and these electrons come from the splitting of water. In a process called photolysis (‘light’ and ‘split’), light energy and catalyst s interact to drive the splitting of water molecules into protons (H+), electrons, and oxygen gas.

Why should the light-dependent reactions occur 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 provides electrons for the light reactions?

Light reactions occur when plants synthesize food from carbon dioxide and water, referring specifically to the part of energy production that requires light and water to generate electrons needed for further synthesis. Water provides the electrons by splitting into hydrogen and oxygen atoms.

What are the four reactants needed for light reaction to occur?

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

How is water used in light reactions?

When water is split, it produces oxygen, hydrogen, and electrons. These electrons move through chloroplast structures and produce ATP via chemiosmosis. The hydrogen is converted to NADPH, which is then utilized in light-independent reactions. As a waste product, oxygen gas diffuses out of the organism.

What happens to water molecules in the light reactions Brainly?

The water is split during the light reaction to form oxygen gas and hydrogen ions. The hydrogen ions are used by the chloroplast to produce ATP.

What is photolysis of water why it is also called light reaction?

Photolysis of water :- It is the process of breakdown of water molecule into hydrogen and oxygen under the influence of light during the light reaction of photosynthesis. In photosynthesis,chemical process by which molecules are broken down into smaller units through the absorption of light.

The Light Reactions of Photosynthesis

Why Water is So Special and Essential to Life

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