A - The organism in which reproduction takes place by the process of breaking up of the body of an organism in two or more parts each of which grows into a new individual.
B - The organism in which the plane of binary fission is transverse.
C - The stage of cell cycle in which synthesis of DNA occurs.
D - The organism which reproduces by gemmation.
Select the option which correctly identifies A,B,C and D.

Q. (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.

Q. An organism having a whip-like structure at one end which reproduces by the process of binary fission is :
(a) Hydra
(b) Paramecium
(c) Leishmania
(d) Plasmodium

Q. Two very small organisms X and Y both reproduce by the method of budding. Organism X is industrially very important because it is used in making alcohol from sugar. It is also used in making bread. Organism Y Lives in freshwater. If organism Y gets cut into a number of parts accidently, each cut part can grow to form complete organism.
(a) What are organisms X and Y?
(b) What is the name of the process in which X converts sugar into alcohol?
(c) To which class of organisms does X belong?
(d) Name an important body feature of organism Y.
(e) Which organism is multicellular and which one is unicellular?