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Question

Life cycle of Ectocarpus and Fucus respectively are :

A
Haplontic, Diplontic
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B
Diplontic, Haplodiplontic
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C
Haplodiplontic, Diplontic
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D
Haplodiplontic, Haplontic
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Solution

The correct option is C Haplodiplontic, Diplontic
In haplo-diplontic life cycle, diploid sporophytic body alternates with multicellular, saprophytic/autotrophic, independent haploid gametophyte. Both the phases are equally prevalent during the liife cycle.

In diplontic life cycle, diploid sporophytic body is predominant and alternates with a very short haploid gametophytic phase.

While most algal genera are haplontic, some of them like Ectocarpus are haplo-diplontic and Fucus is diplontic.

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