Q. No.Mitosis is also called ‘equational division’ because:
| 1. | the number of chromosomes in both daughter cells are the same |
| 2. | the sum of the number of chromosomes in two daughter cells is equal to the number of chromosomes in the parent cell |
| 3. | each progeny cell receives only one set of chromosomes from the parent cell |
| 4. | the number of chromosomes in the parent and the progeny cells is the same |
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Consider the given two statements:
| I. | Morphology of chromosomes is best studied at metaphase |
| II. | At this stage, a chromosome is made up of two sister chromatids, held together at the centromere |
1. Both I and II are true and II explains I
2. Both I and II are true but II does not explain I
3. I is true but II is false
4. I is false but II is true
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All the following key events take place during telophase of mitosis except:
1. Chromosomes cluster at the opposite spindle poles
2. Chromosomes become discrete
3. Nuclear envelope reforms
4. Nucleolus, ER and Golgi complex reform
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Identify the stage of mitosis shown in the given diagram:
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At the metaphase plate:
1. The sister chromatids of a chromosome are connected by their kinetochores to the spindle fibers from the same pole
2. The non sister chromatids of a chromosome are connected by their kinetochores to the spindle fibers from the same pole
3. The sister chromatids of a chromosome are connected by their kinetochores to the spindle fibers from the opposite poles
4. The non sister chromatids of a chromosome are connected by their kinetochores to the spindle fibers from the opposite poles
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During which stage of mitosis do the following events occur?
I. Centromeres split and chromatids separate
II. Chromatids move to opposite poles
| 1. | Prophase | 2. | Metaphase |
| 3. | Anaphase | 4. | Telophase |
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Consider the following two statements:
| I: | Plant cells undergo cytokinesis in a different manner than the animal cells. |
| II: | Plant cells are enclosed by a relatively inextensible cell wall. |
Of the two statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
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Identify the incorrect statement regarding cytokinesis:
| 1. | Animal cells divide by cleavage furrow |
| 2. | Cell plate formation takes place during cytokinesis in plant cells |
| 3. | The cell wall formation in plant cells starts near the existing lateral walls and grows inwards |
| 4. | At cytokinesis, mitochondria and plastids are distributed between daughter cells |
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Liquid endosperm in coconut forms due to:
1. Failure of cytokinesis after karyokinesis
2. Failure of karyokinesis before cytokinesis
3. Disruption of spindle fibers at metaphase
4. Continued DNA replication during cytokinesis
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Statement I: In animal cells, cytokinesis is achieved by the appearance of a furrow in the plasma membrane.
Statement II: During cytokinesis in plant cells, the formation of the new cell wall begins with the formation of a simple precursor called the cell plate that represents the middle lamella between the walls of the two adjacent cells.
1. Statement I and Statement II are correct
2. Statement I is correct but Statement II is incorrect
3. Statement I is incorrect but Statement II is correct
4. Statement I and Statement II are incorrect
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