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Reproduction in Lower and Higher Animals — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYReproduction in Lower and Higher Animals3 Marks
Question
short answer questions
Explain the different methods of reproduction occurring in sponges.
✓

Answer

  1. Sponges reproduce both asexually and sexually and they also possess the power of regeneration. Their sexual reproduction is similar to higher animals even though their body organization is primitive type.
  2. Asexual reproduction in sponges takes place by regeneration, budding and gemmule formation.
  3. In sponges, during unfavourable period, gemmule is produced. It is an internal bud.
  4. Archaeocytes which are dormant cells are seen in the aggregation in gemmule. These cells are capable of developing into a new organism.
  5. Amoebocytes are other cells which secrete thick resistant layer of secretion which is coated around archaeocytes.
  6. When favourable conditions of water and temperature return back, the gemmules can develop into new individuals by hatching, e.g. Spongilla.

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