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 |
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
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 |
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 |
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 |
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 |
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 |
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 |
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. |