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Q. No.G1 phase in a cell cycle:
I:
corresponds to the interval between initiation of mitosis and DNA replication.
II:
is characterised by a metabolically active cell that grows continuously and replicates its DNA.
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 |
From NCERT
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Onion root tip cells have 16 chromosomes in each cell. How many chromosomes will the cell respectively have at G1 phase, after S phase, and after M phase?
1. 8, 8, 8
2. 16, 16, 32
3. 16, 16, 16
4. 16, 32, 32
1. 8, 8, 8
2. 16, 16, 32
3. 16, 16, 16
4. 16, 32, 32
Subtopic: Intro to Cell Cycle & Interphase | Cell Division: Mitosis (Karyokinesis) | Cell Division: Mitosis (Cytokinesis) |
76%
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Karyokinesis involves four stages that are chronologically [beginning at the earliest] arranged as:
1. Prophase → Metaphase → Anaphase → Telophase
2. Telophase → Metaphase → Anaphase → Prophase
3. Prophase → Metaphase → Anaphase → Telophase
4. Telophase → Anaphase → Metaphase → Prophase
1. Prophase → Metaphase → Anaphase → Telophase
2. Telophase → Metaphase → Anaphase → Prophase
3. Prophase → Metaphase → Anaphase → Telophase
4. Telophase → Anaphase → Metaphase → Prophase
Subtopic: Cell Division: Mitosis (Karyokinesis) |
87%
From NCERT
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During mitosis, the complete disintegration of the nuclear envelope marks the start of:
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
Subtopic: Cell Division: Mitosis (Karyokinesis) |
85%
From NCERT
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As each chromosome moves away from the equatorial plate during the anaphase of mitosis:
| 1. | the arms of each chromosome remain directed towards the pole and hence at the leading edge, with the centromere of the chromosome trailing behind. |
| 2. | the arms of each chromosome and the centromere remain directed towards the pole and hence at the leading edge. |
| 3. | the centromere of each chromosome remains directed towards the pole and hence at the leading edge, with the arms of the chromosome trailing behind. |
| 4. | the centromere and the arms of each chromosome do not move and remain at the metaphase plate. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
85%
From NCERT
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Simultaneous splitting of centromeres of each chromosome during mitosis takes place during:
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
Subtopic: Cell Division: Mitosis (Karyokinesis) |
95%
From NCERT
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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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