A: | DNA replication begins in the nucleus |
B: | centriole duplicates in the cytoplasm |
1 | A – Interphase | B – Prophase |
2 | A – S – phase | B – Telophase |
3 | A – Synthetic phase | B – Gap 2 phase |
4 | A – Interphase | B – Anaphase |
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. |
1. | G1 phase | 2. | S phase |
3. | G2 phase | 4. | M phase |
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 |
1. | 16 and 16 | 2. | 16 and 32 |
3. | 8 and 16 | 4. | 16 and 8 |
Statement I: | In male honeybees, haploid cells divide by mitosis. |
Statement II: | Higher plants show mitotic divisions only in diploid cells. |
1. | Statement I is correct and Statement II is incorrect. |
2. | Statement I is incorrect and Statement II is incorrect. |
3. | Statement I is correct and Statement II is correct. |
4. | Statement I is incorrect and Statement II is correct. |
Plant cells do not divided their cytoplasm by forming a furrow in cell membrane like animal cells rather they divide by cell plate because
1. | Plant cell do not have centrioles |
2. | Cell wall formation beings with formation of cell plate |
3. | Cell plate represents middle lamella between the walls of two adjacent cells |
4. | Plant cells are enclosed by a relatively inextensible wall |