Q. No.During diakinesis of prophase I:
I. Terminalisation of chiasmata takes place.
II. Meiotic spindle is assembled.
III. Nucleolus disappears and the nuclear membrane breaks down.
The correct statements are:
1.
I, II and III
2.
I and II only
3.
I and III only
4.
II and III only
I. Terminalisation of chiasmata takes place.
II. Meiotic spindle is assembled.
III. Nucleolus disappears and the nuclear membrane breaks down.
The correct statements are:
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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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What stage of the cell division is shown in the following diagram of a cell undergoing cell division?
| 1. | Prophase I | 2. | Prophase II |
| 3. | Telophase I | 4. | Telophase II |
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Consider the following key events:
| I: | Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements. |
| II: | Nucleolus, Golgi complex and ER reform. |
The stage of mitosis characterized by these key events is:
| 1. | Prophase | 2. | Metaphase |
| 3. | Anaphase | 4. | Telophase |
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During meiosis, the bivalent chromosomes clearly appear as tetrads first at:
| 1. | Zygotene of Prophase I | 2. | Pachytene of Prophase I |
| 3. | Metaphase I | 4. | Anaphase I |
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Consider the following statements regarding meiosis:
| I: | At metaphase I, the microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes. |
| II: | At anaphase I, the homologous chromosomes separate, while sister chromatids remain associated with each other. |
Of the two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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The most important significance of meiosis is that:
1. It increases variations in the gene pool of the species that helps in evolution of that species.
2. It causes growth in the multicellular organisms.
3. It conserves specific number of chromosomes in each species across generations.
4. It is vital for repair and regeneration functions in the living organisms.
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With respect to meiosis, when does DNA replication occur?
| 1. | Before meiosis I only | 2. | After meiosis I only |
| 3. | Before and after meiosis I | 4. | After meiosis II |
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Organisms prefer sexual mode of reproduction in adverse conditions because:
| 1. | It leads to a rapid proliferation of numbers |
| 2. | It requires two individuals that can support the progeny |
| 3. | It is less energy consuming than the asexual mode of reproduction |
| 4. | It provides protection and increases variations that may help progeny to survive |
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