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Latest: NEET 2024 Paper Analysis
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The process of photosynthesis is the conversion of light energy into chemical energy that may be used by living things. It’s a lengthy and complicated process that takes place over a number of stages.
The light reaction is the first stage of photosynthesis, during which light energy is captured and used to produce ATP and NADPH, whereas the dark reaction is the second stage of photosynthesis, during which light energy is captured and used to produce ATP and NADPH, during which the energy from ATP and NADPH is used to produce glucose from glucose.
Phases 1 and 2 of photosynthesis include:
The photochemical or light-dependent process is the initial step. The term “light response” refers to this stage.
The biosynthetic phase of photosynthesis’ dark reaction is the second phase. This is where the process isn’t dependent on light.
Reaction to light and dark
Reactions to Light
Photosynthesis is a sequence of biological events that transform light energy absorbed by light-absorbing pigments (such as chlorophyll) into chemical energy in the form of ATP and NADPH.
Supplement
The light reactions take place on the chloroplast’s thylakoid membranes. There are two types of light reactions: cyclic and non-cyclic. When an electron is displaced from a photosystem in a cyclic reaction, the electron is transmitted down electron acceptor molecules and returned to photosystem I, whence it was emitted. Photons are collected in the light-harvesting antenna complexes of photosystem II by chlorophyll and other accessory pigments in the non-cyclic process.
2H2O + 2NADP+ + 3ADP + 3Pi → O2 + 2 H+ + 2NADPH + 3ATP
Reaction to Darkness
Photosynthesis is a set of metabolic reactions that do not require light to continue and eventually produce organic molecules from carbon dioxide.
Supplement
The dark reactions of photosynthesis are powered by the energy from ATP (made during the light reactions). The phrase “dark reactions” does not imply that the reactions take place at night or that darkness is required. It means that the reactions can continue regardless of the amount of light present. The phrase is solely used to differentiate between dark and light reactions, both of which require light.
ATP + NADPH + CO2 → ADP + NADP + glucose.
Difference between light and dark reaction
Light Reaction | Dark Reaction |
In the absence of light, it does not occur. | Even if there is no sunlight, it can still occur. |
It is a photochemical reaction.. | Biochemically, this is a phase. |
The chloroplast’s grana is where this action takes place. place. | It occurs in the chloroplast’s stroma. |
NADP synthesizes NADPH by using H⁺ ions. | NADPH’s hydrogen reacts with CO₂ to form NADH. |
ATP and NADPH are the final products. | The final result is glucose. Glucose is formed with the help of ATP and NADPH. |
Hydrogen and oxygen are formed when water molecules split. | The body produces glucose. The dark reaction makes use of Co₂. |
PS-II exhibits photolysis. | There is no photolysis. |
Conclusion:
From the following article we can conclude that The light reaction is the first stage of photosynthesis, during which light energy is captured and used to make ATP and NADPH, whereas the dark reaction is the second stage of photosynthesis, during which the energy from ATP and NADPH is used to produce glucose from glucose. The presence or lack of sunshine has an effect on the dark reaction’s outcome.
The dark reaction, on the other hand, is the second stage of photosynthesis, and it is during this stage that the energy from ATP and NADPH is used to synthesize glucose from glucose.The end products of the light reaction are ATP (Adenosine Triphosphate) and NADPH, both of which have assimilatory powers, which are also known as assimilation powers.
