A student is observing a permanent slide showing sequentially the different stages of asexual reproduction taking place in yeast. Name this process and draw diagrams, of what he observes, in a proper sequence.
A student is observing a permanent slide showing sequentially the different stages of asexual reproduction taking place in yeast. Name this process and draw diagrams, of what he observes, in a proper sequence.
Process Name
The asexual reproduction process taking place in yeast is called Budding.
Sequential Stages of Budding in Yeast
- Parent Cell: A mature, single-celled yeast organism with a prominent nucleus.
- Bud Initiation: A small protuberance or outgrowth (bud) begins to form on the cell wall of the parent cell.
- Nuclear Division: The nucleus of the parent cell undergoes division (mitosis), and one daughter nucleus starts migrating into the growing bud.
- Bud Separation / Chain Formation: The bud grows to a mature size, pinches off from the parent cell to become a new independent individual, or sometimes remains attached, forming a chain of buds.
Marking Scheme
- 1Correctly naming the process as Budding (0.5 marks)
- 2Drawing/describing the correct sequence of stages (Parent cell -> Bud initiation -> Nuclear division -> Chain of buds) (1.5 marks)
Hint
The process is called budding. Think of a small bubble growing on a balloon, receiving a copy of the nucleus, and then either pinching off or forming a chain.
Quick Oral Answer
The process is called budding. In this process, a small outgrowth or bud develops on the parent yeast cell. The nucleus divides, and one daughter nucleus moves into the bud. The bud then matures and either detaches or forms a chain of buds.
Analysis & Explanation
Budding is a form of unequal asexual reproduction. Unlike binary fission where a cell splits into two equal halves, budding involves the formation of a small, unequal projection (bud) on the parent body. The nucleus divides mitotically, and one daughter nucleus migrates into the bud. The bud eventually constricts at the base and detaches to live as an independent organism, leaving behind a scar on the parent cell.
Common Mistakes
- 1Confusing budding with binary fission. In binary fission, the parent cell divides into two equal halves, whereas in budding, the division is unequal and a small bud is formed on the parent cell.
- 2Forgetting to show the division and migration of the nucleus into the bud in the diagrams.
Interesting Facts
Yeast cells can divide so rapidly during budding under favorable conditions (like in a warm sugar solution) that new buds start forming on the daughter buds before they even detach, creating a beautiful chain of cells.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2016?
This question carries 2 marks in the CBSE Class 10 Science 2016 examination.
Which chapter does this question come from in Science?
This question is from the chapter "How do Organisms Reproduce?" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Modes of Reproduction used by Single Organisms" from CBSE Class 10 Science.
Has this question appeared in other CBSE Science papers?
Yes, a similar question appeared in the 2016 CBSE Class 10 Science paper.
What type of question is this in the CBSE Class 10 Science 2016 paper?
This is a Short Answer question from Section B in the CBSE Class 10 Science 2016 paper.