science
Grade-10
Easy

Question

Which of the following life cycle is exhibited by Fucus?

  1. Haplontic

  2. Diplontic

  3. Triplontic

  4. Haplo-diplontic

hintHint:

The life cycle followed by angiosperms.

The correct answer is:

Diplontic


    Fucus is a brown algae, which follows diplontic lifecycle.
    In diplontic life cycle:
    • Diploid sporophyte is dominant
    • Haploid sex cells undergo mitosis and form gametes
    • The haploid gametes fuse together to form diploid zygote
    • The zygote divides following mitosis and forms an independent plant
    The gametophyte phase is observed as reduced stage in Fucus.

    • Diplontic life cycle has sporophyte phase as dominant and independent
    • Angiosperms, gymnosperms, Fucus all show diplontic lifestyle

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