Question

Multiple fission occurs in
A. Hydra
B. Plasmodium
C. Planaria
D. All of the above

Answer 1

Hint: Reproduction is defined as the phenomenon that leads to production of its own kind of offspring. Reproduction is a vital process for the continuation of life. There are two forms of reproduction name sexual reproduction and asexual reproduction. Multiple fission is a kind of asexual reproduction.

Complete Answer:
Multiple Fission is defined as asexual mode of multiplication in which one unicellular parent divides and splits internally to form a number of daughter individuals. Multiple fission takes place in protozoans and some unicellular algae. In Amoeba, multiple fission only occurs under unfavourable conditions when the protozoan forms a cyst over it.

Now let us find solution from given options:
- Hydra: Hydra is a multicellular organism. It reproduces mainly by budding. An outgrowth develops on the outside of the body which grows on the parent individual and then gets separated to form a new individual.
- Plasmodium: In plasmodium (malaria parasite) multiple fission is normal mode of asexual reproduction both inside red blood corpuscles and liver. In the very First step the nucleus divides repeatedly to form a number of daughter nuclei.
- Planaria: Planaria is an organism that belongs to phylum Platyhelminthes. Planaria reproduces by the process of regeneration. When any part of the planaria gets broken it gets developed into a complete new organism (planaria).

Hence the correct answer is option B.

Note: Multiple fission forms several (more than two) individuals. Multiple fission takes place both under favourable and unfavourable conditions. Nucleus of the parent undergoes repeated divisions again and again to form a number of daughter nuclei. Cytoplasm does not divide after every nuclear division.