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Question

Which condition is most favorable for the growth of fungi?

This question was previously asked in
RRB Technician 2026 Grade 3 Question Paper (7-Oct-2026) (Shift 3)
The correct answer is

Warm and moist environment with abundant organic matter

Fungi are heterotrophs: they cannot make their own food, and most of them are saprophytes that secrete enzymes onto dead organic matter and absorb the digested nutrients.

They grow best where there is plenty of moisture, a warm temperature (roughly 20–30 °C) and an abundant supply of organic matter. This is why bread, fruits, leather and damp walls become mouldy quickly in the humid rainy season.

Hot deserts with very low humidity and cold, dry places with intense sunlight lack the moisture fungi need, and strong sunlight (ultraviolet rays) and dryness also damage their hyphae and spores.

In extremely cold places with frozen soil, water is locked as ice and metabolism slows down sharply, so fungal growth almost stops; refrigeration and freezing are used to slow mould growth on food for this reason.

Hence, Warm and moist environment with abundant organic matter.

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