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Science — CBSE Class 10 board question

Q1. [1]
Select from the following the conditions responsible for the rapid spread of bread mould on a slice of bread : (i) Formation of large number of spores (ii) Presence of moisture and nutrients in bread (iii) Low temperature (iv) Presence of hyphae
  1. (A) (i) and (ii)
  2. (B) (ii) and (iv)
  3. (C) (ii) and (iii)
  4. (D) (iii) and (iv)
Previously asked in CBSE board exam
2024 31/5/1 Q10
Generated by claude-sonnet-4-6 · 2026-06-15 06:43 · grounding rag
Model Answer

(A) (i) and (ii)

Rapid spread of bread mould is due to formation of large number of spores and presence of moisture and nutrients in bread, which provide ideal conditions for spore germination and growth.

Explanation

The textbook states that spores are produced in sporangia and can develop into new Rhizopus individuals. Spores begin to grow when they contact a moist surface (moisture + nutrients in bread). Low temperature slows growth; hyphae are non-reproductive structures — so (iii) and (iv) are incorrect. Examiners expect students to distinguish reproductive structures (sporangia/spores) from non-reproductive ones (hyphae).

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Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.