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NEET 2017 · BiologyPrevious Year Question

Life cycle of Ectocarpus and Fucus respectively are

Answer: (C) Haplodiplontic, Diplontic. Answer: (C) Haplodiplontic, Diplontic.

  1. A.Haplontic, Diplontic
  2. B.Diplontic, Haplodiplontic
  3. C.Haplodiplontic, Diplontic✓
  4. D.Haplodiplontic, Haplontic

Correct Answer

(C) Haplodiplontic, Diplontic

Solution & Explanation

Answer: (C) Haplodiplontic, Diplontic. Solution: Ectocarpus (a brown alga) shows a haplodiplontic life cycle with an alternation between an independent haploid gametophyte and an independent diploid sporophyte, whereas Fucus is diplontic — the diploid sporophyte is the only free-living dominant phase and meiosis is gametic, producing the gametes directly. Thus Ectocarpus = haplodiplontic and Fucus = diplontic, eliminating the haplontic/Spirogyra-type options. NCERT Reference: Class XI Biology, Plant Kingdom (Plant Life Cycles & Alternation of Generations — content rationalised from current reprint, grounded in pre-2023 NCERT text).

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