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(B) Bread mould (Rhizopus) reproduces through spore formation.$(i)$ The production of a large number of spores allows for widespread dispersal through

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$(i)$ and $(ii)$

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(B) Bread mould (Rhizopus) reproduces through spore formation.$(i)$ The production of a large number of spores allows for widespread dispersal through the air,increasing the chances of landing on a suitable substrate.$(ii)$ Bread provides a rich source of nutrients (carbohydrates) and moisture,which are essential for the germination of spores and the rapid growth of the fungal mycelium.$(iii)$ and $(iv)$ are structural characteristics of the fungus but are not the primary factors responsible for the 'rapid spread' of the mould on the bread surface compared to spore production and environmental conditions.

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

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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