Question

Binary fission is found in
A. Amoeba
B. Paramecium
C. Planaria
D. All of the above

Answer 1

Hint:- Binary fission, asexual replication between two new bodies through the division of the body. In the binary fission process, an organism duplicates its genetic material, or deoxyribonucleic acid ( DNA), and then breaks it into two pieces (cytokinesis), with one copy of DNA obtained from each new organism.

Complete answer:
The main reproductive process of prokaryotic species is binary fission. Depending on the cell division axis, binary fission is also divided into forms, such as transverse or longitudinal, in protists. Strobilation is considered normal transverse fission in certain species, such as tapeworms and scyphostome polyps.
This normally results in a chain of fission products called a strobilus, the proglottids of tapeworms and scyphozoan jellyfish ephyrae; each proglottid or ephyra matures in turn and separates from the end of the strobilus. A few metazoan (multicellular) animals are routinely exposed to simultaneous body division into multiple units, a mechanism called fragmentation. Planarian fission and fragmentation usually reflect direct replication in which the missing parts are regenerated from each section to become an entirely new species. However, products of strobilation are only indirectly reproductive: proglottids are not regenerative, but hold and release vast amounts of eggs and die; ephyrae do not develop new polyps, but grow into sexually reproductive medusae, whose larvae become polyps.
Binary fission can occur in four ways in organisms:
- Irregular: Cytokinesis can occur on either plane in this fission, but it is often perpendicular to the plane of karyokinesis. For example- Amoeba
- Longitudinal: Cytokinesis happens along the longitudinal axis here. For example, with flagellates like Euglena.
- Transverse: Cytokinesis happens along the transverse axis here. For example, in ciliated protozoans, such as Paramecium.
- Oblique: Cytokinesis takes place obliquely in this form of binary fission. Example: Ceratium
From these discussions we can conclude that Binary fission occurs in Amoeba, Paramecium, Planaria. Therefore the correct answer is option (D) “All of the above”.

Note:- Fission can be assumed to be any division of a single population of persons into different parts. For a variety of reasons, including migration or geographic isolation, a population can undergo fission. Since fission of the newly separated, smaller populations contributes to genetic variation, population fission is a precursor to speciation.