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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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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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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 |
93%
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 meiotic cell division, the simultaneous splitting of the centromere of each chromosome allowing sister chromatids to move toward opposite poles of the cell by shortening of microtubules attached to kinetochores, occurs during:
1. Metaphase I
2. Metaphase II
3. Anaphase I
4. Anaphase II
1. Metaphase I
2. Metaphase II
3. Anaphase I
4. Anaphase II
Subtopic: Cell Cycle: Meiosis II |
81%
From NCERT
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The cell shown in the given figure is most likely at:
1. Metaphase I
2. Metaphase II
3. Anaphase I
4. Anaphase II
1. Metaphase I
2. Metaphase II
3. Anaphase I
4. Anaphase II
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
64%
From NCERT
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Independent assortment occurs in eukaryotic organisms during meiotic:
1. Metaphase I
2. Metaphase II
3. Anaphase I
4. Anaphase II
1. Metaphase I
2. Metaphase II
3. Anaphase I
4. Anaphase II
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
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The events of a cell cycle:
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: | are themselves under genetic control |
| II: | have to take place in a coordinated way |
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: Intro to Cell Cycle & Interphase |
95%
From NCERT
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