Q. No.Consider the given two statements:
I. The kinetochore is essential for the chromosome segregation that is classically associated with mitosis and meiosis.
II. The kinetochore assembles on the centromere and links the chromosome to microtubule polymers from the mitotic spindle during mitosis and meiosis.
1. Both I and II are correct and II explains I
2. Both I and are correct but II does not explain I
3. I is correct and II is incorrect
4. Both I and II are incorrect
| 1. | Disappearance of nucleolus | 2. | Chromosome movement |
| 3. | Synapsis | 4. | Spindle fibres |
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Centromeres split leading to the separation of sister chromatids and the pulling of the separated sister chromatids to the opposite poles is seen in:
| I: | Mitotic anaphase |
| II: | Anaphase I |
| III: | Anaphase II |
| 1. | Only I |
| 2. | Only I and II |
| 3. | Only III |
| 4. | Only I and III |
| 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. |
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Attachment of spindle fibers to kinetochores of chromosomes becomes evident in:
| 1. | Anaphase | 2. | Telophase |
| 3. | Prophase | 4. | Metaphase |
If you are provided with root-tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?
| 1. | Telophase | 2. | Anaphase |
| 3. | Prophase | 4. | Metaphase |
Plants show mitotic divisions:
1. only in germ line cells
2. at the root apex and shoot apex only
3. in both diploid and haploid cells
4. for the productions of gametes only
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Consider the following events:
I. Centromere split and chromatids separate
II. Chromatids move to opposite poles
The stage of mitosis characterized by these two events is:
| 1. | Prophase | 2. | Metaphase |
| 3. | Anaphase | 4. | Telophase |
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The phase of the cell cycle that lasts for the least time is the:
| 1. | G1 phase | 2. | S phase |
| 3. | G2 phase | 4. | M phase |
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The stage of mitosis shown in the given diagram is:
 |
|
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