Question:

During photosynthesis, oxygen in glucose comes from

Updated On: Aug 15, 2022

oxygen in air
water
carbon dioxide
both (b) and (c).

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The Correct Option is C

Solution and Explanation

Ruben and Kamen (1941) and Ruben et al (1941) suspended Chlorella in water having nonradioactive heavy isotope of oxygen, O , instead of natural oxygen O. The suspension was illuminated. Oxygen evolved was tested by means of mass spectrometer. It was found to be heavy isotope, O.This is possible only if oxygen evolved during photos ynth es is comes from splitting of water. The oxygen in glucose comes from carbon dioxide. $ {6CO2 + 12H2 ^18O ->[{light}][{chlorophyll, \,enzymes}] C6H12O6 + 6H2O + 6 ^18O2 ? }$

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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)