Given below are two statements:
Assertion (A): | Cell division does not occur in asexually reproducing cells. |
Reason (R): | Cell division is always equational. |
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. |
Assertion (A): | Meiosis induces new combination of traits in organisms. |
Reason (R): | Crossing over occurs between sister chromatids of chromosomes. |
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. |
t.
1. | Chromosomal material condenses. |
2. | Nucleolus, Golgi complex and ER reform. |
3. | Chromosomes move to spindle equator and get aligned. |
4. | Chromosomes arranged at metaphase plate split simultaneously. |
(a) | G0 stage |
(b) | Post mitotic gap phase |
(c) | Resting phase |
(d) | Separation of cytoplasm |
1. | Duplication of centrioles |
2. | Disintegration of nuclear envelope |
3. | Decondensation of chromosomes |
4. | Development of nuclear envelope |
1. | Metaphase | 2. | G2 phase |
3. | Anaphase | 4. | Prophase |
A: | Mitosis is seen in both diploid and haploid cells. |
B: | Meiosis involves two sequential cycles of nuclear and cell division but only a single cycle of DNA replication. |
1. | Only statement A is correct. |
2. | Only statement B is correct. |
3. | Both statements are incorrect. |
4. | Both statements are correct. |
1. | Anaphase and telophase |
2. | Prophase and telophase |
3. | Metaphase and anaphase |
4. | Metaphase only |