Question

It is mentioned that binary fission and multiple fission take place according to favourable and unfavourable conditions. Why is it so?

Answer 1

binary fission needs favourable conditions
but multiple fission takes place in unfavourable conditions because it has to survive before its killed(when its in our body)
I hope it helps
: )

Answer 2

Mostly, binary fission ocurs under favourable conditions.
Binary fission is a type of asexual reproduction observed mostly in unicellular organisms.
*It involves the longitudinal or transverse splitting of an organism into two equal halves which develop into two separate individuals.
*Binary fission is generally seen in organisms such as amoeba and paramecium falling into the category of protozoa.
*Amoeba is a simple, unicellular organism which reproduces by binary fission. The division begins with the division of nucleus followed by protoplasmic division.  .

Under unfavourable conditions organism does not stop reproducing but divides rapidly inside a cyst and forms many individuals inside the cyst, when favourable conditions prevail, organism releases multiple individuals at the same time which are formed by multiple fission.
Plasmodium is a malarial parasite which reproduces both inside a mosquito and also in human being.
*It chooses multiple fission, asexual mode of reproduction for producing the cells.
*Multiple fission is the division of mother cell into many daughter cells simultaneously.
*A multinucleate mass is formed with rich cytoplasm which does not undergo division until certain amount of time.
*The specific reason behind the organism reproducing by multiple fission is that, it can divide itself into many cells at the same time inside the cyst during unfavourable conditions in the host.