Anabaena are blue-green algae that belong to the Kingdom Monera and contain a specialised cell in filaments known as heterocyst, which is responsible for __________.

reproduction

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locomotion

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protection

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nitrogen fixation

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Solution

The correct option is D
nitrogen fixation
Anabaena, also known as blue-green algae, belong to Kingdom Monera. They have specialised cells known as heterocyst that can fix atmospheric nitrogen.

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