Question:
During photosynthesis, plants
During photosynthesis, plants
Updated On: Jul 28, 2022
- absorb $O_2$, release $CO_2$
- release $O_2$, absorb $CO_2$
- absorb $N_2$, release $O_2$
- absorb $N_2$, release $NH_3$
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The Correct Option is B
Solution and Explanation
Photosynthesis is the chemical process by which green plants and other phototrophs synthesize organic compounds from carbon dioxide and water in the presence of sunlight. It occurs in the chloroplasts. The light-dependent reactions require the presence of light, energy from sunlight is absorbed by photosynthetic pigments (chiefly the green pigment chlorophyll) and used to bring about the photolysis of water :
$H_2O \to 2H^+ + 2e^- + 1/2 O_2$
The electrons released by this reaction pass along a series of electron carrier molecules; as they do so they lose their energy, which is used to convert $ADP$ to $ATP$ in the process of photophosphorylation. The electrons and protons produced by the photolysis of water are used to reduce $NADP$.
$2H^+ + 2e ^-+ NADP^+ \to NADPH + H^+$
The $ATP$ and $NADPH$ produced during the light-dependent reactions provide energy and reducing power, respectively, for the ensuing light-independent reactions. During these reactions carbon dioxide is reduced to carbohydrate in metabolic pathway known as the Calvin cycle. Photosynthesis can be summarized by the equation;
$CO_2 + 2H_2O \to [CH_2O_2] + H_2O + O_2$
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Concepts Used:
Photosynthesis in Higher Plants
Processes Of Photosynthesis in Higher Plants:
Photosynthesis in higher plants involves the following processes:
- Light Reaction
- Dark Reaction
Light Reaction:
- This phenomenon occurs in the presence of light.
- The pigment absorbs light and produces energy in the form of ATP.
- The process involves- absorption of light, water splitting, the release of oxygen, and formation of ATP and NADPH.
Dark Reaction:
This process occurs in the absence of light in the stroma of the chloroplasts. The following cycles are involved in the process:
- Calvin Cycle (C3 Cycle)
- C4 Cycle (Hatch and Slack Pathway)