Question

l
when a moist slice of bread was kept in a cold and dark place for a couple of days, some
organisms grew on it to form a fluffy cottony mass which later turned black. On seeing
through a magnifying glass some thread like projections and thin filaments having bulb
like structures at the tip were observed.
(a) Write the common name of the organism observed. Name the mode of reproduction
that made the organism grow and spread over the bread.
(b) Draw the diagram of the organism observed and label its parts.
(C) Name and write about the structure of the cells that are responsible for its
[Hint. (a) Bread mould - Spore formation: (a) 'Spores
reproduction.
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Answer 1

Answer:

a) The organism is rhizopus. The mode of reproduction isasexual reproduction.

c)The thread-like structure that is developed in the bread is known as hyphae. The tiny blob-on-a-stick structures are involved in reproduction. The blobs are sporangia, which contains cells, or spores , that can eventually develop into new rhizopus individuals. The spores are covered by thick walls that protect them until they comeinto contact with another moist surface and can begin to grow