ICSE Class 8 Answered
What is formation of a cyst by secreting a hard resistant covering
Asked by arghadeep856 | 28 May, 2019, 09:53: PM
Expert Answer
- Amoeba reproduces primarily by binary fission.
- However, a method known as multiple fission is adopted by the unicellular organism Amoeba to survive and reproduce under unfavourable conditions.
- When the conditions are unfavourable, Amoeba withdraws its pseudopodia and becomes almost round. It secretes a hard covering called cyst.
- The cyst forms a thick protective coat around it. Inside the cyst, the nucleus undergoes repeated divisions to form many nuclei.
- Nuclear division is followed by the division of cytoplasm. Hence, eventually many new daughter cells are formed.
- On the return of favourable conditions, the cyst bursts open to release these daughter cells.
Answered by Sheetal Kolte | 29 May, 2019, 10:50: AM
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