Q. No.
Which one of the following precedes the reformation of the nuclear envelope during the M phase of the cell cycle:
| 1. | Decondensation from chromosomes and reassembly of the nuclear lamina |
| 2. | Formation of the contractile ring and formation of the phragmoplast |
| 3. | Formation of the contractile ring and transcription from chromosomes |
| 4. | Transcription from chromosomes and reassembly of the nuclear lamina |
Crossing over that results in genetic recombination in higher organisms occurs between:
| 1. | Non-sister chromatids of a bivalent |
| 2. | Two daughter nuclei |
| 3. | Two different bivalents |
| 4. | Sister chromatids of a bivalent |
In the somatic cell cycle:
| 1. | DNA replication takes place in S-phase |
| 2. | A short interphase is followed by a long mitotic phase |
| 3. | \(G_2\) phase follows the mitotic phase |
| 4. | In the \(G_1\) phase, DNA content is double the amount of DNA present in the original cell |
Amount of cellular DNA increases during:
| 1. | Cytokinesis | 2. | Fertilisation |
| 3. | Mutation | 4. | Respiration |
If you are provided with the 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 |
Spindle fiber unites with which structure of chromosomes:
1. Chromocenter
2. Chromomere
3. Kinetochore
4. Centriole
The best material for the study of mitosis in the laboratory:
| 1. | Anther | 2. | Root tip |
| 3. | Leaf tip | 4. | Ovary |
If a diploid cell is treated with colchicine then it becomes:
1. Triploid
2. Tetraploid
3. Diploid
4. Monoploid
At which stage of the cell cycle does DNA replication occur:
1. G1 - phase
2. S - phase
3. G2 - phase
4. M - phase
© 2026 GoodEd Technologies Pvt. Ltd.