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Q. No.Telophase of mitosis is characterised by all the following events, except:
1.
Chromosomes cluster at opposite spindle poles, and their identity is lost as discrete elements.
2.
Nuclear envelope develops around the chromosome clusters at each pole, forming two daughter nuclei.
3.
Nucleolus, Golgi complex and ER reform.
4.
Pairing of homologous chromosomes.
Subtopic: Cell Division: Mitosis (Karyokinesis) | Cell Cycle: Meiosis I |
93%
From NCERT
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Mitosis accomplishes:
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: | the segregation of duplicated chromosomes into daughter nuclei (karyokinesis) |
| II: | division of the cell into two daughter cells by the separation of cytoplasm (cytokinesis) |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Cell Division: Mitosis (Karyokinesis) | Cell Division: Mitosis (Cytokinesis) |
88%
From NCERT
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In a plant cell, cytokinesis is achieved by:
| 1. | the appearance of a furrow in the plasma membrane which gradually deepens and ultimately joins in the centre dividing the cell cytoplasm into two. |
| 2. | the appearance of the cell-plate and the formation starts in the centre of the cell and grows outward to meet the existing lateral walls. |
| 3. | the appearance of a furrow in the plasma membrane which starts in the centre of the cell and grows outward to meet the existing lateral walls. |
| 4. | the appearance of the cell-plate and the formation starts in the periphery of the cell and grows inward to meet the existing central walls. |
Subtopic: Cell Division: Mitosis (Cytokinesis) |
86%
From NCERT
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Consider the two statements:
| Assertion (A): | Meiosis ensures the production of haploid phase in the life cycle of sexually reproducing organisms. |
| Reason (R): | Syngamy restores the diploid condition in sexually reproducing organisms. |
| 1. | (A) is true; (R) is False |
| 2. | Both (A) and (R) are True and (R) correctly explains (A) |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 4. | (A) is False; (R) is True |
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
63%
From NCERT
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Identify the correct statements regarding Meiosis:
1. I and II only
2. III and IV only
3. I and IV only
4. II and III only
| I: | Meiosis involves two sequential cycles of nuclear and cell division called meiosis I and meiosis II but only a single cycle of DNA replication. |
| II: | Meiosis I is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase and the daughter cells of meiosis I replicate DNA during interkinesis. |
| III: | Meiosis involves pairing of heterologous chromosomes and recombination between sister chromatids of homologous chromosomes. |
| IV: | Four haploid cells are formed at the end of meiosis II. |
1. I and II only
2. III and IV only
3. I and IV only
4. II and III only
Subtopic: Cell Cycle: Meiosis I |
92%
From NCERT
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Match the phases of Prophase I in Column I with corresponding events in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A | Zygotene | P | Recombination |
| B | Pachytene | Q | Terminalisation of chismata |
| C | Diplotene | R | Synapsis |
| D | Diakinesis | S | Dissolution of synaptonemal complex |
| A | B | C | D | |
| 1. | R | P | S | Q |
| 2. | R | P | Q | S |
| 3. | P | R | S | Q |
| 4. | P | R | Q | S |
Subtopic: Cell Cycle: Meiosis I |
85%
From NCERT
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During pachytene of prophase I of meiosis I:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | the four chromatids of each bivalent chromosome become distinct and clearly appear as tetrads. |
| II: | there is the appearance of recombination nodules. |
| III: | crossing over occurs. |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Cell Cycle: Meiosis I |
81%
From NCERT
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The beginning of diplotene of prophase I of meisosis I is recognised by:
I: the dissolution of the synaptonemal complex.
II: and the tendency of the recombined homologous chromosomes of the bivalents to separate
from each other at the sites of crossovers.
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: the dissolution of the synaptonemal complex.
II: and the tendency of the recombined homologous chromosomes of the bivalents to separate
from each other at the sites of crossovers.
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 |
From NCERT
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Which stage of prophase I of meiosis I can last for months or years in oocytes of some vertebrates?
1. Zygotene
2. Pachytene
3. Diplotene
4. Diakinesis
1. Zygotene
2. Pachytene
3. Diplotene
4. Diakinesis
Subtopic: Cell Cycle: Meiosis I |
91%
From NCERT
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During Metaphase I:
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: | The bivalent chromosomes align on the equatorial plate. |
| II: | The microtubules from the opposite poles of the spindle attach to the kinetochore of homologous chromosomes. |
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 |
92%
From NCERT
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