The factors responsible for the rapid spreading of bread mould on slices of bread are:
(i) presence of large number of spores in air
(ii) presence of large number of thread-like branched hyphae
(iii) presence of moisture and nutrients
(iv) formation of round shaped sporangia
(a) (i) and (iii)    (b) (ii) and (iv)    (c) (i) and (ii)    (d) (iii) and (iv)

Correct Answer: (a) (i) and (iii)

Explanation:

The factors responsible for the rapid spreading of bread mould on slices of bread are the presence of a large number of spores in the air and the presence of moisture and nutrients.

The sporangium of bread mould disperses numerous spores in the air that germinate on a substratum under favourable conditions to form hyphae. These multiple hyphae branch among themselves and entangled to form mycelium. Being saprophyte in nature, fungi can grow when supplied with enough nutrients and moisture.