CBSE Class 10 Science 2019 · Paper 31/2/1 · Question 24(b)
After examining a prepared slide under the high power of a compound microscope, a student concludes that the given slide shows the various stages of binary fission in a unicellular organism. Write two observations on the basis of which such a conclusion may be drawn.
Answer
The nucleus is seen elongated or divided into two, and a deepening constriction splits the cell into two nearly equal daughter cells.
(i) The nucleus is seen elongated in some cells and divided into two nuclei in others - the nucleus divides first.
(ii) A constriction appears in the cytoplasm (cell membrane) across the middle of the cell and deepens, dividing the cell into two nearly equal daughter cells, each with a nucleus.
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