The major portion of the dry weight of plants comprises of ______________.

Carbon, Nitrogen and Hydrogen

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Carbon, Hydrogen and Oxygen

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Nitrogen, Phosphorous and Potassium

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Calcium, Magnesium and Sulphur

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Solution

The correct option is A Carbon, Hydrogen and Oxygen
The major portion of dry weight of plant comprises of carbon, hydrogen and oxygen. These elements are called as framework element. They are involved in building up of cell walls and storage products of plants.
Hence B is the correct option.

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Plant macronutrients, carbon, oxygen and hydrgen constitute about __________ % of a plant's dry weight.

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