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    science
    Grade-10
    Easy

    Question

    A diplontic life cycle is observed in:

    1. Chlamydomonas

    2. Bryophytes

    3. Algae

    4. All of the above

    Hint:

    An informal term for a large and diverse group of photosynthetic eukaryotes.

    The correct answer is:

    Algae

      • The diploid life cycle is exhibited by some algae and all phanerogams, or seed-bearing plants.
      • Brown alga Fucus has a diploid life cycle. The body of the plant is a diploid thallus. The haploid stage is represented by oogonia and pistils formed by meiosis of the germ cells present in the fertilized egg.
      • Oogonia and Antheridia produce eggs and sperm, respectively, which fuse to form diploid zygotes. The fertilized egg (2n) undergoes mitosis into the thallus.
      • Other algae that exhibit a diploid life cycle are the green algae Cladophora and Acetabularia, diatoms, and others.
      • All seed-bearing plants, namely gymnosperms and angiosperms, exhibit a diploid life cycle.

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