What is the importance of light in photosynthesis?

Answer 1

The equation of photosynthesis is as below:

Carbon dioxide + Water ---------> Glucose + Oxygen

This reaction takes place in the presence of light and chlorophyll.

The process of photosynthesis is completed in two stages:-

Light Reactions: When light falls on leaves, it is absorbed by the chlorophyll in the chloroplasts. The solar energy is utilized to split water into oxygen and hydrogen, this process is called photolysis, and oxygen is released during this process. As these reactions take place only in the presence light, they are called light reactions.

During light reactions two compounds are formed when solar energy is converted into chemical energy, these are:

1. NADPH (Nicotinamide Adenine Di-nucleotide Phosphate)
2. ATP (Adenosine Tri-Phosphate)

NADP already exists in the cells of the leaf. The hydrogen released on the photolysis of water molecule is accepted by this compound and it becomes reduced to form NADPH.

NADP (in cell) + H (from water) ---------> NADPH

This reaction takes place in the presence of light and enzymes.

The compound ADP (Adenosine Di-Phosphate) is already present in the cells of the leaf and combines with the phosphate group using light energy to form a compound called ATP.

ADP + P ---------> ATP

This reaction also takes place in the presence of light and enzymes.

These compounds are energy rich and are needed for the dark reactions in photosynthesis.

Dark Reactions: Utilizing the energy from ATP and the hydrogen from NADPH, water combines with carbon dioxide to form carbohydrates. Thus, the solar energy is now converted into chemical energy to form glucose. Other organic compounds are further synthesized from this glucose.

This stage is also completed in a series of chemical reactions with the help of enzymes . Scientists have discovered an interesting thing about these two stages: only the first requires light, and the second can occur in the dark. So we call these reactions light and dark reactions respectively. Neither light energy nor chlorophyll are required for the dark reactions.

Various steps of the dark reactions were studied by a scientist named Melvin Calvin, thus dark reactions are also known as Calvin's Cycle. When scientists performed experiments with chlorella plant, they found the rate of photosynthesis increased in non-continuous supply of light and again if the temperature is raised during dark reactions, the rate increases invariably. This also proved that light reactions are photochemical reactions which involve light, and dark reactions are chemical reaction which do not involve light.

Answer 2

The light and dark reactions of photosynthesis are two processes that work together in order to make the glucose.

The light reaction:

Starts with the light energy hitting photosystem number 2 and that light energy from the sun is passed between the antennae molecules inside the photosystem. Then, once the light energy is finally hit to the center molecule, called the reaction center, it makes the electrons in the center molecule to become excited, or to contain alot of energy. Since, the electrons contain so much energy they are released into and electron transport chain. In the electron trapsport chain the electrons are passed between each acceptor as it releases energy. The released energy forms a concentration gradient that makes the H ions move through the thylakoid membrane and then the energy from the concentration gradient energy moves the H ions across the membrane and down the ATP synthase (this process is also called chemiosmosis). then the energy from that photophosphorylates ADP into ATP.

Answer 3

During the day, the light absorbed from the sun produces energy molecules, like ATP. Regardless of the amount of light available, though, the energy produced with ATP is then used to create carbohydrates. This allows for continuous energy usage, despite long periods gone without energy consumption.

Answer 4

Carbon dioxide + Water ---------> Glucose + Oxygen

This reaction takes place in the presence of light and chlorophyll.

The process of photosynthesis is completed in two stages:-

Light Reactions: When light falls on leaves, it is absorbed by the chlorophyll in the chloroplasts. The solar energy is utilized to split water into oxygen and hydrogen, this process is called photolysis, and oxygen is released during this process. As these reactions take place only in the presence light, they are called light reactions.

During light reactions two compounds are formed when solar energy is converted into chemical energy, these are:

1. NADPH (Nicotinamide Adenine Di-nucleotide Phosphate)
2. ATP (Adenosine Tri-Phosphate)

NADP already exists in the cells of the leaf. The hydrogen released on the photolysis of water molecule is accepted by this compound and it becomes reduced to form NADPH.

NADP (in cell) + H (from water) ---------> NADPH

This reaction takes place in the presence of light and enzymes.

The compound ADP (Adenosine Di-Phosphate) is already present in the cells of the leaf and combines with the phosphate group using light energy to form a compound called ATP.

ADP + P ---------> ATP

This reaction also takes place in the presence of light and enzymes.

These compounds are energy rich and are needed for the dark reactions in photosynthesis.

Dark Reactions:Utilizing the energy from ATP and the hydrogen from NADPH, water combines with carbon dioxide to form carbohydrates. Thus, the solar energy is now converted into chemical energy to form glucose. Other organic compounds are further synthesized from this glucose.

This stage is also completed in a series of chemical reactions with the help of enzymes . Scientists have discovered an interesting thing about these two stages: only the first requires light, and the second can occur in the dark. So we call these reactions light and dark reactions respectively. Neither light energy nor chlorophyll are required for the dark reactions.

Various steps of the dark reactions were studied by a scientist named Melvin Calvin, thus dark reactions are also known as Calvin's Cycle. When scientists performed experiments with chlorella plant, they found the rate of photosynthesis increased in non-continuous supply of light and again if the temperature is raised during dark reactions, the rate increases invariably. This also proved that light reactions are photochemical reactions which involve light, and dark reactions are chemical reaction which do not involve light.

Read more: What_are_light_and_dark_reactions_in_photosynthesis

Answer 5

light serves as one of the most essential components of photosynthesis :]

Answer 6

The plant needs energy from the light in order to do photosynthesis

Answer 7

Those are two steps of photosynthesis. both of them are very important.

Answer 8

Those are the two steps of photosynthesis. Main importance is making C6H12O6.