What is light reaction and dark reaction in chloroplast.
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Answers
Answer:
- LIGHT REACTION and DARK REACTION
Light reaction only takes place in the presence of light. Dark reaction takes place with the presence or absence of sunlight.
DEPENDENCY
Light reaction is considered as the light dependent reaction. Dark reaction is not dependent on light.
ALSO CALLED
Light reaction is also called as photo-chemical phase. Dark reaction is also called as bio-synthetic phase.
TAKES PLACE
Light reaction takes place in the grana thylakoids of the chloroplast. Dark reaction takes place in the Stroma of the chloroplast.
REACTION
In light reaction, H+ ions are utilized by NADP ( Nicotinamide Adenine Dinucleotide Phosphate) to form NADPH. In dark reaction, the hydrogen of NADPH Is use it to combine with CO2.
END PRODUCTS
The end products of light reaction are ATP (Adenosine Triphosphate) and NADPH, which are also called as assimilatiory powers. The end product of direction is called glucose. ATP and NADPH help in the formation of glucose.
EFFECT`
In light reaction, the water molecule splits and oxygen is released. In dark reaction, the carbon dioxide is utilized and glucose is produces.
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Light reaction → The reactions in green plants which are directly dependent on light are known as light reactions.
- It occurs in membrane system,i.e., thylakoids of chloroplast.
- ATP and NADPH are products of this reaction.
Dark reaction → The reactions which do not directly depend on light and are rather dependent on products of light reaction, i.e., ATP and NADPH , are known as dark reactions.
- In these reactions, fixation of CO2 takes place which leads to the formation of sugars.
- It takes place in stroma of chloroplast.