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Q. No.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
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
Subtopic: Cell Division: Mitosis (Cytokinesis) |
74%
From NCERT
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Cells at the end of prophase of mitosis, when viewed under the microscope, do not show:
| I: | Golgi complexes |
| II: | Endoplasmic reticulum |
| III: | Nucleolus |
| IV: | Nuclear envelope |
1. Only I and II are correct
2. Only III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
Subtopic: Cell Cycle: Meiosis I |
89%
From NCERT
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Identify the correct statement regarding meiosis amongst the following:
| I: | Meiosis involves two sequential cycles of nuclear and cell divisions but only a single cycle of DNA replication. |
| II: | Meiosis II is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase. |
| III: | Meiosis involves pairing of bivalents and recombinations between them. |
| 1. | I only | 2. | I and II only |
| 3. | I and III only | 4. | I, II and III |
Subtopic: Cell Cycle: Meiosis I |
59%
From NCERT
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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 |
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
93%
From NCERT
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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 |
Subtopic: Cell Cycle: Meiosis I |
92%
From NCERT
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Which stage of meiosis is shown in the diagram given below?
| 1. | Metaphase I | 2. | Metaphase II |
| 3. | Anaphase I | 4. | Anaphase II |
Subtopic: Cell Cycle: Meiosis II |
70%
From NCERT
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Crossing over or recombination can be defined as:
| 1. | exchange of segments between sister chromatids of homologous chromosomes |
| 2. | exchange of segments between non sister chromatids of homologous chromosomes |
| 3. | exchange of segments between sister chromatids of heterologous chromosomes |
| 4. | exchange of segments between non sister chromatids of heterologous chromosomes |
Subtopic: Cell Cycle: Meiosis I |
90%
From NCERT
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Which of the following is not a feature of diakinesis stage of prophase I of meiosis I?
| 1. | Terminalization of chiasmata |
| 2. | Meiotic spindle assembling to prepare separation of homologues |
| 3. | Decondensation of the chromatin |
| 4. | NEBD and disappearance of nucleolus |
Subtopic: Cell Cycle: Meiosis I |
60%
From NCERT
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The paired homologues seen during zygotene of meiosis I are known as:
1. Bivalent
2. Tetrad
3. Mitotic apparatus
4. Sister chromosomes
1. Bivalent
2. Tetrad
3. Mitotic apparatus
4. Sister chromosomes
Subtopic: Cell Cycle: Meiosis I |
81%
From NCERT
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Identify the correct statement amongst the following:
| 1. | Crossing over occurs in prophase I of meiosis and metaphase of mitosis. |
| 2. | DNA replication occurs once prior to mitosis and twice prior to meiosis. |
| 3. | Both mitosis and meiosis result in daughter cells identical to the parent cells. |
| 4. | Karyokinesis occurs once in mitosis and twice in meiosis. |
Subtopic: Cell Division: Mitosis (Karyokinesis) | Cell Cycle: Meiosis I |
78%
From NCERT
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