What is Binary fission in bacteria.

Which of the following statement about microorganisms true?

Factors responsible for the rapid spread of bread mould on slices of bread are 
$\left(i\right)$ A large number of spores.
$\left(ii\right)$ Availability of moisture and nutrients in bread.
$\left(iii\right)$ Presence of tubular branched hyphae.
$\left(iv\right)$ Formation of round shaped sporangia.

The microorganism which lives in the root nodules of leguminous plants is a :

Understand the relationship and complete the following. 
For example, Children: milk teeth:: Adult: Permanent teeth
Conversion of milk into curd: _____ :: Fluffy and soft bread: fungi

Fill in the blank with the correct option provided in the bracket.

The bacteria form a hard outer coating called _____ (cyst/plasmid/LPS), which protects them from unfavourable conditions.