CBSE Class 10 Science 2017 · Paper 31/1/1 · Question 35
Name the type of asexual reproduction in which two individuals are formed from a single parent and the parental identity is lost. Write the first step from where such a type of reproduction begins. Draw first two stages of this reproduction.
Answer
It is binary fission; its first step is the elongation of the cell and nucleus, and the nucleus then divides into two.
Binary fission (for example, in Amoeba).
The first step is the elongation of the cell and its nucleus: after the DNA is copied, the nucleus lengthens and then splits into two (karyokinesis), and only then does the cytoplasm divide (cytokinesis).
First two stages: (1) the parent cell lengthening, with its nucleus elongated and dividing into two; (2) the lengthened cell with two nuclei and its cytoplasm beginning to constrict in the middle (see the figure).
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