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Q. Three most abundant elements in protoplasm are

Uttarkhand PMTUttarkhand PMT 2007

Solution:

Three most abundant elements in protoplasm are $C, H$ and $ O_{2} $ . Nitrogen is also present in protoplasm all these $4$ making $90\%$ of protoplasm. The largest constituent element of protoplasm is $ O_{2} $ by weight ($63\%$).