Question

Which of the following animals is having longitudinal binary fission?
A. Euglena
B. Plasmodium
C. Planaria
D. Paramecium

Answer 1

Hint: It is found in the unicellular eukaryotes having flagella.

Complete answer:
Fission is a type of asexual reproduction. It is the division of one entity into two or more parts that grow separately and forms a new entity.
Euglena reproduces through asexual reproduction by the process of binary fission.
In Euglena, binary fission is longitudinal, here division occurs along the longitudinal axis.
Binary fission is a process of mitosis, where cell organelles are duplicated and two separate sets of daughter cells are formed.

Additional information:

Fission may be of two types:
- Binary fission – in this single organism produces two parts.
- Multiple fissions – in this single organism produces many parts.

Binary fission in an organism can occur in four ways:
- Irregular – cell divides in any plane are always perpendicular to the division of the nucleus.
- Longitudinal – cell division occurs along its longitudinal axis.
- Transverse – cell division takes place along the transverse axis.
- Oblique – cell division occurs Obliquely.

So, the correct answer is Euglena.

                                               Longitudinal Binary Fission in Euglena

Note: In Plasmodium reproduction takes place through multiple fission, Planaria reproduces by fragmentation asexual reproduction in which organism is broken into several pieces and each piece develops into new individual and lastly Paramecium reproduces by transverse binary fission.