Question:

Which metal ion is a constituent of chlorophyll?

Updated On: Jul 7, 2022

Iron
Copper
Magnesium
Zinc

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The Correct Option is C

Solution and Explanation

Magnesium is a constituent of chlorophyll. Chlorophylls are the green photosynthetic pigments. Five types of chlorophylls $a, b, c, d$ and $e$ occur in plants. Out of these only chlorophylls a and b occur in the chloroplasts of higher plants. Molecular formula of chlorophyll $a, b, c$ and $d$ are $C_{55}H_{72}O_{5}N_{4}\,Mg, C_{55}H_{70}O_{6}N_{4}\,Mg, C_{35}H_{32}O_{5}N_{4}\,Mg$ and $C_{54}H_{70}O_{6}N_{4}\,Mg$ respectively. Chlorophyll $e$ is a rare type found in some golden algae.

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Notes on Photosynthesis in higher plants

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)