Which of the following algae grow to great heights?

Gracilaria

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Kelps

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Porphyra

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Polysiphonia

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Solution

The correct option is B Kelps
Kelps are members of phaeophyceae and are found primarily in marine habitats. They show great variation in size and form. They may reach a height of 100 metres.

Gracilaria, Porphyra and Polysiphonia are members of rhodophyceae and have height less than 15 metres. Hence, they do not grow as much as kelps.

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