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Q. No.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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The stage of meiosis I, characterised by the following events, is:
I: The nuclear membrane and nucleolus reappear.
II: Some dispersion of chromosomes.
1. Prophase I
2. Metaphase I
3. Anaphase I
4. Telophase I
I: The nuclear membrane and nucleolus reappear.
II: Some dispersion of chromosomes.
1. Prophase I
2. Metaphase I
3. Anaphase I
4. Telophase I
Subtopic: Cell Cycle: Meiosis I |
94%
From NCERT
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In contrast to meiosis I, meiosis II:
| 1. | is much lengthy in duration. |
| 2. | leads to reduction in the number of chromosomes. |
| 3. | is characterised by replication of DNA just before its beginning. |
| 4. | resembles a normal mitosis. |
Subtopic: Cell Cycle: Meiosis II |
83%
From NCERT
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