Isomorphic alternation of generations is seen in

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Laminaria

Ectocarpus

Sphagnum

Pteris

answer is A.

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Detailed Solution

In Ectocarpus, the gametophyte and sporophyte are morphologically identical but genetically different and alteration such gametophytes and sporophytes in the life cycle is described as isomorphic alternation of generations. It is seen in certain algae like Ectocarpus, Cladophora and Polysiphonia (gametophyte and tetrasporophyte).

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