Question 27: (a) What is meant by the term ‘fission’ as used in biology ? (b) How does binary fission differ from multiple fission ? (c) Name one organism which reproduces by binary fission and another which reproduces by multiple fission. (d) State whether the above named organisms are animals or plants. Lakhmir Singh Biology Class 10
Answers
a) Fission is the process in which the parent cell divides into two or more daughters cells.
b) Binary fission:
The process in which the parent cell divides into two daughter cells.
Multiple fission :
The process in which the parent cell divides into more than two daughter cells.
c) Binary fission :Amoeba
Multiple fission :Plasmodium
d) They are animals
"(a) ‘Fission’ in biology refers to the division of a mother cell into two or more daughter cells. If the division is into two daughter cells, it is called binary fission and if it is into a greater number of daughter cells, it is called multiple fission.(b)
BINARY FISSION MULTIPLE FISSION
The mother cell divides into two daughter cells in binary fission. The mother cell divides into more than two daughter cells in multiple fission.
It generally occurs under favourable conditions. It generally occurs under unfavourable conditions.
IMG: 23_6
(c) Bacteria usually reproduce via binary fission whereas amoebae under unfavourable conditions usually reproduce via multiple fission.
(d) Bacteria and amoebae are considered to be heterotrophs and thus can be classified as animals.
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