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Q. No.Consider the following statements regarding meiosis:
I:
At metaphase I, the microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes.
II:
At anaphase I, the homologous chromosomes separate, while sister chromatids remain associated with each other.
Of the two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Cell Cycle: Meiosis I |
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Which of the following does not take place during telophase of mitosis?
| 1. | Chromosomes become discrete. |
| 2. | Nuclear envelope reforms. |
| 3. | Chromosomes cluster at opposite spindle poles. |
| 4. | Nucleolus, endoplasmic reticulum, and Golgi complex reform. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
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Level 2: 60%+
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How many of the given statements are true?
1. 1
2. 2
3. 3
4. 4
| I: | Gametes contain half the number of chromosomes found in somatic cells. |
| II: | Somatic cells have the diploid number of chromosomes. |
| III: | The haploid number of chromosomes in humans is 23. |
| IV: | The diploid number of chromosomes in humans is 23 pairs. |
2. 2
3. 3
4. 4
Subtopic: Intro to Cell Cycle & Interphase | Cell Division: Mitosis (Karyokinesis) | Cell Division: Mitosis (Cytokinesis) |
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Consider the given two statements:
| Assertion (A): | Meiosis is the mechanism by which conservation of specific chromosome number of each species is achieved across generations in sexually reproducing organisms. |
| Reason (R): | Meiosis results in reduction of chromosome number by half in gametes. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Cell Cycle: Meiosis I |
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Which stage of prophase I of meiosis is characterised by the dissolution of the synaptonemal complex and the tendency of the recombined homologous chromosomes of the bivalents to separate from each other except at the sites of crossovers?
| 1. | Zygotene | 2. | Pachytene |
| 3. | Diplotene | 4. | Diakinesis |
Subtopic: Cell Cycle: Meiosis I |
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How many of the given statements are correct?
| I: | In an animal cell, cytokinesis is achieved by the appearance of a furrow in the plasma membrane. |
| II: | In plant cells, wall formation starts in the centre of the cell and grows outward to meet the existing lateral walls. |
| III: | At the time of cytoplasmic division, organelles like mitochondria and plastids get distributed between the two daughter cells. |
| 1. | 0 | 2. | 1 |
| 3. | 2 | 4. | 3 |
Subtopic: Cell Division: Mitosis (Cytokinesis) |
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Anaphase stage of mitosis is characterised by which of the following key events?
| Statement I: | Centromeres split and chromatids separate. |
| Statement II: | Chromatids move to opposite poles. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is incorrect. |
| 3. | Statement I is correct and Statement II is correct. |
| 4. | Statement I is incorrect and Statement II is correct. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
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Kinetochores:
1. I is correct; II & III are incorrect
2. I & II are correct; III is incorrect
3. I, II & III are correct
4. I, II & III are not correct.
| I: | are small disc-shaped structures at the surface of the centromeres. |
| II: | serve as the sites of attachment of spindle fibres to the chromosomes. |
| III: | are same as centromeres. |
2. I & II are correct; III is incorrect
3. I, II & III are correct
4. I, II & III are not correct.
Subtopic: Cell Division: Mitosis (Karyokinesis) |
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Consider the given two statements:
| Assertion (A): | Metaphase is the stage at which morphology of chromosomes is most easily studied. |
| Reason (R) : | At metaphase, condensation of chromosomes is completed. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
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Consider the given two statements:
| Assertion (A): | Mitosis is also called as equational division. |
| Reason (R): | The number of chromosomes in the parent cells undergoing mitosis and progeny cells is the same. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
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