Death of protoplasm is a pre-requisite for a vital function like:

Transport of food

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Exchange of gases

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Mineral uptake

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Transport of sap

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Solution

The correct option is A Transport of food
In Cyanophyceae, many filamentous forms possess some specialized cell of disputed nature called heterocyst, which helps in nitrogen fixation, e.g., Nostoc, Anabaena etc.

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