science
Grade-10
Easy

Question

Alternation of generation is important because:

  1. Allows only sexual mode of replication.

  2. Allows both sexual and asexual mode of replication.

  3. Allows only asexual mode of replication.

  4. None of the above

hintHint:

Method of reproduction depends on environmental conditions.

The correct answer is:

Allows both sexual and asexual mode of replication.


    • Lifecycle of plants and algae include alteration of generation
    • The plants and algae will alternate between diploid and haploid phases
    • Gametophyte and sporophyte are the sexual and asexual phases
    • During alteration of generation:
    1. Sporophyte is multicellular diploid phase that produces haploid spores by meiosis
    2. Spores divide mitotically to form multicellular haploid gametophyte
    3. Gametophyte produces haploid  gametes
    4. Gametes fertilize to form diploid zygote
    5. Zygote develops into sporophyte
    6. Cycle continues
    • Depending upon the type of plant, the dominance of phases (either haplontic or diplontic) will occur

    • Alteration of generation is rotation between sporophyte and gametophytic generation
    • Alteration of generation allows reproduction in plants depending upon the environmental conditions

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