Q.Name an organism where cell division is itself a mode of reproduction.

Fission is the division of a parent organism's body into two or more genetically identical daughter individuals; of the four recognised kinds of fission in animals (binary fission, multiple fission, sporulation and strobilation), binary fission - splitting the parent into exactly two - is the most common, and is itself classified into four types by the plane along which the division runs. In every case the nucleus divides first (either amitotically or mitotically, a step called karyokinesis), and only afterwards does the cytoplasm divide (cytokinesis), so the two resulting daughter organisms are genetic copies of the parent and of each other. Simple irregular binary fission occurs in shapeless organisms such as Amoeba, where the division plane is hard to identify - the contractile vacuoles disappear, the nucleoli break down, the nucleus divides mitotically, and the cell constricts at its middle to form two daughters. Transverse binary fission runs across the organism's transverse axis, as in Paramecium (whose macronucleus divides amitotically while i …