| 1 |
Some student of SSC observed a thin cross section ffrom root tip of onion plant under the microscope. They found divising cells at different stages of their life cycle. One of the students found a cell at late prophase and counted 28 chromosomes in it. The number of chromosomes in daughter cells should be. |
14
28
56
09
|
| 2 |
During celll division spindle fibres attach a chromosome at. |
Telomere
Centromere
Upper arm of chromosomes
Lower arm of chromosome
|
| 3 |
Substance and energy required for replication for DNA is accumulated in cell during. |
G1
G2
S-Phase
M-Phase
|
| 4 |
Why is meiosis II necessary after meiosis I? |
To replicate chromosomes
To separate sister chromatids
To ensure genetic recombination
To reduce chromosomes number
|
| 5 |
Which event is unique to meiosis but not mitosis. |
DNA Replication
Crossing over
Chromosomes alignment
Nuclear division
|
| 6 |
Which one is the feature of mitosis but not of meiosis II? |
Crossing over
Separation of sister chromatids
Daughter cells with same number of chromosomes
Sepearation of homologous chromosomes
|
| 7 |
An organism has 4 pairs of chromosoems . Afger meiosis-I , how many chromosomes and chromatids will be present in each daughter cell. |
8 Chromosomes and 16 chromatids
4 chromosomes and 8 chromatids
4 chromosomes and 4 chromatids
8 chromosomes and 8 chromatids
|
| 8 |
Centrosomes make mitotic spindle in. |
Plant cells
Animal Cells
Prokaryotic cells
All of these
|
| 9 |
How does the centrosome contribute to mitosis. |
Initiates DNA replication
Make mitotic spindle
Forms the nuclear envelope
Duplicates organelles
|
| 10 |
If you observe a cell in which nuclear memberane is reforming around two sets of chromosomes, what stage of cell cycle is this |
Anaphase
Telephase
Metaphase
Prophase
|
| 11 |
At which stage of mitosis chromosomes line up in the centre. |
Prophase
Anaphase
Metaphase
Telophase
|
| 12 |
In which phase of cell cycle, the chromosomes duplicate. |
S Phase
G1 Phase
Mitosis
G2 Phase
|
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