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Solution


Q.

Factors responsible for the rapid spread of bread mould on slices of bread are

(i) large number of spores.
(ii) availability of moisture and nutrients in bread.
(iii) presence of tubular branched hyphae.
(iv) formation of round shaped sporangia.
1 (i) and (iii)  
2 (ii) and (iv)  
3 (i) and (ii)  
4 (iii) and (iv)  

Ans.

(3)

The sporangium of the bread mould releases huge number of spores, which germinate on a suitable substratum and form hyphae. Fungi are saprophytes so profuse growth is only possible in the presence of an appropriate substratum, such as bread, that provides a considerable amount of moisture and nutrients.