The plant body of the brown algae is attached to the substratum by

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Solution

Plant Body of brown algae

The plant body or thallus of the brown algae like kelp is made up of three main parts:

Stipe

Frond

Holdfast

Holdfasts are the root-like structures, present at the base of the algal plant body. These help in anchorage of the algae to the substratum.

Final answer: (a) Holdfast

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