After observing the prepared slides of binary fission in amoeba and budding in yeast following observations were reported : (a) Single cells of amoeba and yeast were undergoing binary fission and budding respectively. (b) Cytokinesis was observed in the yeast cell. (c) Elongated nucleus was dividing to form two daughter nuclei in amoeba. (d) A chain of buds were observed due to reproduction in amoeba. The correct observation(s) is /are :
After observing the prepared slides of binary fission in amoeba and budding in yeast following observations were reported : (a) Single cells of amoeba and yeast were undergoing binary fission and budding respectively. (b) Cytokinesis was observed in the yeast cell. (c) Elongated nucleus was dividing to form two daughter nuclei in amoeba. (d) A chain of buds were observed due to reproduction in amoeba. The correct observation(s) is /are :
Options
Option A is correct. The correct observations are (a) and (c).
Marking Scheme
- 11 Mark for selecting Option A (observations a and c).
Hint
Remember that Amoeba undergoes binary fission (nuclear elongation and division) and yeast undergoes budding (which can form a chain of buds).
Quick Oral Answer
Under a microscope, binary fission in Amoeba shows an elongated dividing nucleus, while budding in yeast shows small outgrowths (buds) or chains of buds attached to a parent cell.
Analysis & Explanation
Let us analyze the given observations:
- Observation (a): "Single cells of amoeba and yeast were undergoing binary fission and budding respectively." This is correct because both Amoeba and yeast are unicellular organisms that reproduce via binary fission and budding, respectively.
- Observation (b): "Cytokinesis was observed in the yeast cell." This is not a primary defining observation for yeast budding under standard slide comparisons, as budding involves unequal division and is characterized by bud formation rather than typical equal cytokinesis.
- Observation (c): "Elongated nucleus was dividing to form two daughter nuclei in amoeba." This is correct because karyokinesis (nuclear division) is a prominent visible stage of binary fission in Amoeba.
- Observation (d): "A chain of buds were observed due to reproduction in amoeba." This is incorrect because budding and chains of buds occur in yeast, not in Amoeba.
Therefore, only observations (a) and (c) are correct, which corresponds to Option A.
Common Mistakes
- 1Students often misread observation (d) and associate 'chain of buds' with Amoeba instead of yeast, or fail to recognize that both are unicellular organisms.
Interesting Facts
Yeast cells can reproduce so rapidly by budding that the buds remain attached, forming a temporary chain of cells called a pseudomycelium.
Spotted a mistake or something unclear?
Tell us — we fix reported answers fast.
Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2012?
This question carries 1 mark in the CBSE Class 10 Science 2012 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 "Binary Fission in Amoeba and Budding in Yeast" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2012 paper?
This is a MCQ question from Section B in the CBSE Class 10 Science 2012 paper.