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Q. No.The onion root tip cell has 16 chromosomes (2n). What would be the number of chromosomes in this cell after the S phase and at the end of mitotic anaphase, respectively?
1.
16 and 16
2.
16 and 32
3.
8 and 16
4.
16 and 8
Subtopic: Intro to Cell Cycle & Interphase |
56%
From NCERT
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Given below are two statements:
| Assertion (A): | Meiosis does not occur in haploids cells. |
| Reason (R): | Haploid cells do not form gametes. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Intro to Cell Cycle & Interphase | Cell Cycle: Meiosis I |
From NCERT
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Given below are two statements:
| Assertion (A): | During anaphase-1 of meiosis, non-homologous chromosomes separate. |
| Reason (R): | There is splitting of centromere during anaphase-1. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
62%
From NCERT
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Unidentical chromatids of a chromosome move to opposite poles during:
1. Anaphase II
2. Telophase
3. Mitotic anaphase
4. Anaphase I
1. Anaphase II
2. Telophase
3. Mitotic anaphase
4. Anaphase I
Subtopic: Cell Cycle: Meiosis II |
55%
From NCERT
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Consider the given two statements:
| Assertion (A): | Cell division is a very important process in all living organisms. |
| Reason (R): | During the division of a cell, DNA replication and cell growth also take place. |
| 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: Intro to Cell Cycle & Interphase |
From NCERT
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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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The given figure shows a cell at various stages of mitosis. What will be the number of chromosomes and content of DNA in the cells shown if the number of chromosomes and the content of DNA was 2N and 2C respectively at G1 phase?
1. 2N and 2C
2. 2N and 4C
3. 4N and 2C
4. 4N and 4C
1. 2N and 2C
2. 2N and 4C
3. 4N and 2C
4. 4N and 4C
Subtopic: Intro to Cell Cycle & Interphase | Cell Cycle: Meiosis II |
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The final stage of meiotic prophase I, diakinesis, is marked by:
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: | terminalisation of chiasmata |
| II: | decondensation of chromosomes |
| III: | assembly of the meiotic spindle |
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 |
59%
From NCERT
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Chromosomes duplicate during __A__ and increase in number of chromosomes is observed first during __B__. Identify A & B correctly.
| 1 | A – Interphase | B – Prophase |
| 2 | A – S – phase | B – Telophase |
| 3 | A – Synthetic phase | B – Gap 2 phase |
| 4 | A – Interphase | B – Anaphase |
Subtopic: Intro to Cell Cycle & Interphase | Cell Division: Mitosis (Karyokinesis) |
From NCERT
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Select the correct sequence of events occurring during prophase-I of meiosis-I
| (a) | Nuclear envelope breakdown |
| (b) | Synaptonemal complex formation |
| (c) | Compaction of chromosomes |
| (d) | Terminalisation of chiasmata |
| (e) | Crossing over |
Choose the most appropriate answer from the options given below:
| 1. | (c) → (b) → (e) → (d) → (a) |
| 2. | (c) → (a) → (b) → (d) → (e) |
| 3. | (b) → (c) → (a) → (d) → (e) |
| 4. | (c) → (a) → (b) → (e) → (d) |
Subtopic: Cell Cycle: Meiosis I |
65%
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