CBSE Class 10 Science 2018 · Paper 31(B)/C · Question 25
When a student observes a slide showing different stages of binary fission in Amoeba, he generally observes four stages of the process. Describe these stages in a proper sequence.
Answer
The rounded parent Amoeba divides its nucleus into two, a constriction forms between the nuclei, and the cell splits into two daughter Amoebae.
(i) A single parent Amoeba with one nucleus; it withdraws its pseudopodia and becomes rounded.
(ii) The nucleus elongates and divides into two daughter nuclei.
(iii) A constriction appears in the cytoplasm (cell membrane) in the middle of the cell, between the two nuclei, and deepens.
(iv) The cytoplasm divides at the constriction, forming two daughter Amoebae, each with one nucleus.
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