1. | Complete disintegration of nuclear envelope takes place. |
2. | Chromosomes are highly condensed. |
3. | Metaphase chromosomes are made up of four sister chromatids held together by centromere. |
4. | Chromosomes lie at the equator of the cell. |
1. Pachytene of Prophase I | 2. Diplotene of Prophase I |
3. Metaphase II | 4. Anaphase II |
A: | Prophase I and arrow shows chiasmata |
B: | Anaphase I and arrow shows sister chromatids associated at centromere |
C: | Prophase II and arrows show attachment of spindle microtubules to kinetochore |
D: | Anaphase II and the diagram shows separated sister chromatids after the split of centromere |
1. | Only A, B and C | 2. | Only A, C and D |
3. | Only B, C and D | 4. | A, B, C and D |
Animal cell | Plant cell | |
A. | Furrow formed using actin and myosin | Vesicles from Golgi move to centre |
B. | The furrow reaches centre from periphery | Tubular structures merge to form plasma membrane |
C. | Cells pinched apart | Pectins deposited leading to formation of middle lamella |
1. | Only A and B | 2. | Only A and C |
3. | Only B and C | 4. | A, B and C |
A | B | C | D | |
1. | Interphase | Telophase | Prophase | Anaphase |
2. | Interkinesis | Anaphase | Prophase | Metaphase |
3. | Interkinesis | Telophase | Metaphase | Anaphase |
4. | Interphase | Prophase | Metaphase | Anaphase |
1. | Two phases | 2. | Three phases |
3. | Four phases | 4. | Five phases |
1. | At the end of the G1 phase |
2. | At the end of the S phase |
3. | At the end of Anaphase |
4. | In the resultant daughter cells |
Assertion(A): | Meiosis is the mechanism by which conservation of specific chromosome number of each species is achieved across generations in sexually reproducing organisms. |
Reason(R): | Meiosis increases the genetic variability in the populations of organisms from one generation to the next. |
1. | Both (A) and (R) are true and (R) correctly explains (A) |
2. | (A) is true but (R) is false |
3. | (A) is false but (R) is true. |
4. | Both (A) and (R) are true but (R) does not correctly explain (A). |