An alga which can be possibly used in space flight (Space Alga) is

Nostoc

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Chlorella

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Ulothrix

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Spirogyra

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Solution

The correct option is B Chlorella
Chlorella is a green algae. It is a rich source of proteins and contains high levels of iron, vitamins and amino acids. Being an alga it provides oxygen and consumes the carbon dioxide exhaled by humans. This reduces the requirement of carrying heavy oxygen tanks in space flights. Thus the correct answer is option B.

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