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Question

Consider the diagram below which represents Photosynthetic reactions. Choose the option that correctly matches the names to the numbers (i), (ii), (iii). Also, the option must match with the involvement of chlorophyll i.e.: a-Light reaction or b-Calvin-Benson Cycle.


A

(i) Water, (ii) Oxygen, (iii) Carbon dioxide; chlorophyll is used in a-Light reactions

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B

(i) Carbon dioxide, (ii) Oxygen, (iii) Water; chlorophyll is used in a-Light reactions

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C

(i) Oxygen, (ii) Water, (iii) Carbon dioxide; chlorophyll is used in b-Calvin Benson cycle

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D

(i) Water, (ii) Carbon dioxide, (iii) Oxygen; chlorophyll is used in b-Calvin Benson cycle

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Solution

The correct option is A

(i) Water, (ii) Oxygen, (iii) Carbon dioxide; chlorophyll is used in a-Light reactions


The first part of the diagram depicts the light reaction in which water is used along with NADP and ADPs and gets converted into oxygen, NADPH and ATP. NADP and ATP are both compounds that store energy. Therefore, ( i) is water and (ii) is oxygen. Chlorophyll is involved in the light reaction.
The later part of the diagram depicts Calvin-Benson cycle which is a part of dark reaction. Here carbon dioxide gets synthesized into more complex molecule i.e. glucose. Therefore (iii) is carbon dioxide.


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