explain the process of reproduction in spirogyra and mosses?
Asked by nathsantanukumar | 10th Apr, 2018, 04:56: PM
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 | 11th Apr, 2018, 02:24: PM
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