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Q. No.Match the following events that occur in their respective phases of cell cycle and select the correct option
| (a) | G1 phase | (i) | Cell grows and organelle duplication |
| (b) | S phase | (ii) | DNA replication and chromosome duplication |
| (c) | G2 phase | (iii) | Cytoplasmic growth |
| (d) | Metaphase in M-phase | (iv) | Alignment of chromosomes |
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (iii) | (iv) | (i) | (ii) |
| 3. | (iv) | (i) | (ii) | (iii) |
| 4. | (i) | (ii) | (iii) | (iv) |
Subtopic: Intro to Cell Cycle & Interphase |
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Onion root tip cell has 16 chromosomes. This cell will have 16 chromosomes:
I: at G1 phase
II: after S phase
III: after M phase
1. I is correct; II & III are incorrect
2. I & II are correct; III is incorrect
3. I, II & III are correct
4. I, II & III are not correct
I: at G1 phase
II: after S phase
III: after M phase
1. I is correct; II & III are incorrect
2. I & II are correct; III is incorrect
3. I, II & III are correct
4. I, II & III are not correct
Subtopic: Intro to Cell Cycle & Interphase |
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Consider the given statements regarding the 24 hour average duration of cell cycle of a human cell:
I: The M Phase represents the phase when the actual cell division takes place.
II: The interphase represents the phase between two successive M phases.
III: Cell division proper lasts for only about 50% of the duration of the cell cycle.
IV: The interphase lasts for about 50% of the duration of cell cycle.
1. Only I and II are correct
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
I: The M Phase represents the phase when the actual cell division takes place.
II: The interphase represents the phase between two successive M phases.
III: Cell division proper lasts for only about 50% of the duration of the cell cycle.
IV: The interphase lasts for about 50% of the duration of cell cycle.
1. Only I and II are correct
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
Subtopic: Intro to Cell Cycle & Interphase |
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In plant cells during the S phase,
1. Only A is correct
2. Only B is correct
3. Both A and B are correct
4. Both A and B are incorrect
| A: | DNA replication begins in the nucleus |
| B: | centriole duplicates in the cytoplasm |
2. Only B is correct
3. Both A and B are correct
4. Both A and B are incorrect
Subtopic: Intro to Cell Cycle & Interphase |
From NCERT
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Consider the given two statements:
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.
| Statement I: | The cells that do not divide further exit G1 phase to enter quiescent phase of the cell cycle. |
| Statement II: | Cells in the quiescent phase of the cell cycle remain metabolically inactive and do not divide. |
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: Intro to Cell Cycle & Interphase |
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Match the phases of the cell cycle with their descriptions:
1. 1-C, 2-A, 3-D, 4-B
2. 1-D, 2-C, 3-B, 4-A
3. 1-A, 2-D, 3-C, 4-B
4. 1-B, 2-A, 3-D, 4-C
| Column I | Column II | ||
| 1 | G1 phase | A | DNA replication |
| 2 | S phase | B | Mitosis |
| 3 | G2 phase | C | Cell growth and preparation for DNA synthesis |
| 4 | M phase | D | Preparation for mitosis |
1. 1-C, 2-A, 3-D, 4-B
2. 1-D, 2-C, 3-B, 4-A
3. 1-A, 2-D, 3-C, 4-B
4. 1-B, 2-A, 3-D, 4-C
Subtopic: Intro to Cell Cycle & Interphase |
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At the end of the S-phase during the cell cycle in a typical eukaryotic animal cell [having 2N chromosome number and 2C DNA content at the G1 phase]:
| 1. | The chromosome number and DNA content remain 2N and 2C respectively |
| 2. | The chromosome number and DNA content are 4N and 2C respectively |
| 3. | The chromosome number and DNA content are 2N and 4C respectively |
| 4. | The chromosome number and DNA content are 4N and 4C respectively |
Subtopic: Intro to Cell Cycle & Interphase |
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How many of the given statements regarding cytokinesis are true?
1. 2
2. 3
3. 4
4. 5
| I: | In an animal cell, this is achieved by the appearance of a furrow in the plasma membrane. |
| II: | The furrow gradually deepens and ultimately joins in the centre dividing the cell cytoplasm into two. |
| III: | In plant cells, wall formation starts in the centre of the cell and grows outward to meet the existing lateral walls. |
| IV: | The formation of the new cell wall begins with the formation of a simple precursor, called the cell-plate that represents the middle lamella between the walls of two adjacent cells. |
| V: | At the time of cytoplasmic division, organelles like mitochondria and plastids get distributed between the two daughter cells. |
2. 3
3. 4
4. 5
Subtopic: Cell Division: Mitosis (Karyokinesis) | Cell Division: Mitosis (Cytokinesis) |
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Consider the given two statements:
| Assertion (A): | Metaphase is the stage at which morphology of chromosomes is most easily studied. |
| Reason (R): | At this stage, metaphase chromosome is made up of two sister chromatids, which are held together by the centromere. |
| 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 Division: Mitosis (Karyokinesis) |
From NCERT
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In an animal 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) |
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