science
Grade-10
Easy

Question

Which life cycle is seen in Chlamydomonas?

  1. Haplontic

  2. Diplontic

  3. Haplo-diplontic

  4. None of the above

hintHint:

Set of chromosomes found in gametes.

The correct answer is:

Haplontic


    Alteration of generation is a common phenomenon found in plants and algae. The diploid and haploid stages appear alternating during their life cycle.
    Alteration of generation depends upon the type of plant. In some, the diploid stage is dominant (like bryophytes) while haploid stage is dominant in others (like tracheophytes).
    The gametophytic stage is dominant in Chlamydomonas and hence, haplontic in nature. This is because, the only diploid phase zygote undergoes meiosis and forms meiospores which are haploid.  

    • Alteration of generation depends upon plant or algae
    • Chlamydomonas have dominant gametophytic stage
    • Gametophytic stage are haplontic in nature

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