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Q. No.The complex formed by a pair of synapsed homologous chromosomes, called a bivalent or a tetrad, is most clearly visible during which given stage of the meiotic cell division?
1. G2 phase
2. Leptotene
3. Zygotene
4. Pachytene
Subtopic: Cell Cycle: Meiosis I |
85%
From NCERT
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Identify the incorrect statement:
| 1. | The growth of multicellular organisms is due to mitosis. |
| 2. | Mitosis distorts the nucleo-cytoplasmic ratio in a cell. |
| 3. | A very significant contribution of mitosis is cell repair. |
| 4. | Mitotic divisions in the meristematic tissues – the apical and the lateral cambium, result in a continuous growth of plants throughout their life. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
92%
From NCERT
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How many of the given statements are true?
1. 1
2. 2
3. 3
4. 4
| I: | Growth and reproduction are characteristics of cells, indeed of all living organisms. |
| II: | Although cell growth (in terms of cytoplasmic increase) is a continuous process, DNA synthesis occurs only during one specific stage in the cell cycle. |
| III: | The interphase lasts more than 95% of the duration of cell cycle. |
| IV: | During the G2 phase, proteins are synthesised in preparation for mitosis while cell growth continues. |
1. 1
2. 2
3. 3
4. 4
Subtopic: Intro to Cell Cycle & Interphase |
86%
From NCERT
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Consider the given two statements:
| Assertion (A): | Meiosis occurs in all sexually-reproducing single-celled and multicellular organisms (which are all eukaryotes), including animals, plants and fungi. |
| Reason (R): | Alternating cycles of meiosis and fertilization enable sexual reproduction, with successive generations maintaining the same number of chromosomes. |
| 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 |
64%
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Consider the given two statements:
| Statement I: | In Metaphase I, the microtubules from the opposite poles of the spindle attach to the kinetochore of homologous chromosomes. |
| Statement II: | In Metaphase II, the microtubules from opposite poles of the spindle get attached to the kinetochores of sister chromatids. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
95%
From NCERT
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Consider the given two statements:
| Statement I: | Mitosis is equational division in which the chromosome number of the parent is conserved in the daughter cell. |
| Statement II: | Meiosis is the reduction division since it reduces the chromosome number by half while making the gametes. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Cell Cycle: Meiosis I |
99%
From NCERT
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The difference between mitosis anaphase and anaphase I of meiosis is:
| 1. | Chromosomes line up at the equatorial plate in anaphase I of meiosis |
| 2. | Sister chromatids separate in mitosis anaphase, whereas homologous chromosomes separate in anaphase I of meiosis |
| 3. | Only mitosis anaphase leads to genetically identical daughter cells |
| 4. | Anaphase I of meiosis does not involve spindle fibers |
Subtopic: Cell Division: Mitosis (Karyokinesis) | Cell Cycle: Meiosis I |
93%
From NCERT
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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) |
61%
From NCERT
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Consider the following statements regarding meiosis:
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
| 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. |
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 |
86%
From NCERT
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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) |
72%
From NCERT
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