CBSE Class 10 Science 2017 · Paper 531/1 · Question 36
Explain the process of budding in yeast by drawing labelled diagrams of different stages of the process in a correct sequence.
Answer
In yeast, a bud grows on the parent cell, receives a daughter nucleus, and separates as a new cell or forms a chain.
Budding in yeast (asexual reproduction), in sequence:
(1) A parent yeast cell has one nucleus.
(2) A small outgrowth, the bud, appears on one side of the parent.
(3) The nucleus divides into two, and one daughter nucleus moves into the bud.
(4) The bud grows and the neck joining it to the parent narrows.
(5) The bud separates as a new yeast cell; buds may also stay attached and bud again, forming a chain of buds.
The labelled diagrams (parent cell, nucleus, bud, daughter nucleus, new yeast cell, chain of buds) are in the figure.
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