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Q.
The first step for initiation of photosynthesis will be
AIPMTAIPMT 2000Photosynthesis in Higher Plants
Solution:
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.