Which of the following algae contains mannitol as reserve food material?

Ulothrix

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Ectocarpus

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Gracilaria

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Volvox

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Solution

The correct option is B Ectocarpus
Mannitol is a complex carbohydrate which is one of the stored food materials in the members of Phaeophyceae (Brown algae).
Example - Ectocarpus

Ulothrix and Volvox belong to Chlorophyceae (Green algae) and store reserve food in the form of starch.

Gracilaria belongs to Rhodophyceae (Red algae) and stores reserve food in the form of floridean starch.

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Food is stored as floridean starch in Rhodophyceae. Mannitol is the reserve food material of which group of algae?

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