Question:
The first step for initiation of photosynthesis will be
The first step for initiation of photosynthesis will be
Updated On: Jul 25, 2024
- photolysis of water
- excitement of chlorophyll molecules due to absorption of light
- ATP formation
- glucose formation.
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The Correct Option is B
Solution and Explanation
Photosynthesis is actually oxidation reduction process in which water is oxidised and CO2, is reduced to carbohydrates. The reduction of CO, to carbohydrates needs assimilatory powers, i.e., ATP and NADPH2. The process of photosynthesis involves two steps- (i) Light dependent phase or photochemical reaction. (ii) Light independent these or dark reaction. Light reaction occurs in grana fraction of chloroplast and in this reaction are included those activities, which are dependent on light. Assimilatory powers (ATP and NADPH2) are mainly produced in this light reaction. The grana of chloroplasts contains many collaborating molecules of pigment. A quantum of light is absorbed by a single antenna chlorophyll, then it migrates from one molecule to the other till it reaches the reaction center. This quantum of light is used for generating ATP and NADPH.
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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)