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ICSE Class 8 Answered

explain the process of reproduction in spirogyra and mosses?

Asked by nathsantanukumar | 10 Apr, 2018, 04:56: PM
Expert Answer

Reproduction in Spirogyra:

  • Spirogyra reproduces sexually as well as asexually.
  • Asexually it reproduces by fragmentation. The vegetative filament breaks into smaller fragments. Each fragment grows and produces a longer filament.
  • Sexual reproduction occurs by a process known as conjugation, in which cells of two filaments lying side by side are joined by outgrowths called conjugation tubes.
  • This allows the contents of one cell to completely pass into and fuse with the contents of the other.
  • The resulting fused cell called the zygote becomes surrounded by a thick wall and overwinters, while the vegetative filaments die.

Reproduction in Mosses:

  • Mosses reproduce sexually as well as asexually.
  • Asexually, they can reproduce by regeneration and gemma formation.
  • They regenerate a new plant from any plant parts such as protonema, shoot tips, leaves, and rhizoids.
  • They also bear special structures called gemmae arising from the protonema. These are propagation bodies and can develop into new plants.
  • Sexually reproduction comprises of two steps- formation of gametes which fuse to form a zygote followed by meiosis with the reduction of the chromosome number to produce haploid cells. 
Answered by Sheetal Kolte | 11 Apr, 2018, 02:24: PM
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