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The major portion of the dry weight of plants comprises of

1. Carbon, hydrogen and oxygen
2. Nitrogen, phosphorus and potassium
3. Calcium, magnesium and sulphur
4. Carbon, nitrogen and hydrogen

Correct answer: Carbon, hydrogen and oxygen

Solution

Most of a plant’s dry mass comes from organic compounds like cellulose, starch, and sugars. These are composed mainly of carbon, hydrogen, and oxygen, making them the dominant elements in dry weight.

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