Q. No.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
Given below is a schematic break-up of the phases/stages of cell cycle. Which one of the following is the correct indication of the stage/phase in the cell cycle?
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During mitosis, endoplasmic reticulum and nucleolus begin to disappear at:
| 1. | Late metaphase | 2. | Early prophase |
| 3. | Late prophase | 4. | Early metaphase |
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The complex formed by a pair of synapsed homologous chromosomes is called
| 1. | Equatorial plate | 2. | Kinetochore |
| 3. | Bivalent | 4. | Axoneme |
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Arrange the following events of meiosis in correct sequence
(a) Crossing over
(b) Synapsis
(c) Terminalisation of chiasmata
(d) Disappearance of nucleolus
| 1. | (b), (c), (d), (a) | 2. | (b), (a), (d), (c) |
| 3. | (b), (a), (c), (d) | 4. | (a), (b), (c), (d) |
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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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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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A point in the animal cell cycle, at which the cell becomes "committed" to the cell cycle, occurs in:
| 1. | G1 phase | 2. | S phase |
| 3. | G2 phase | 4. | M phase |
Identify the human cell for which the interphase period lasts the entire life of a person.
| 1. | Hepatocyte | 2. | Bone marrow stem cells |
| 3. | Epidermal cell | 4. | Neuron |
Which of the following distinguishes the prophase I of meiosis from the prophase of mitosis?
1. homologous chromosomes pair up
2. spindle forms
3. nuclear membrane breaks down
4. chromosomes become visible
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