General
✓✗In plant cells, cytokinesis takes place by
- formation of a furrow in the plasma membrane
- budding
- cell plate formation
- fragmentation
General
✓✗Which division of meiosis is reductional?
- Meiosis II
- Meiosis I
- Neither
- Both meiosis I and II
General
✓✗Prophase I is subdivided into how many phases?
- Four
- Five
- Two
- Three
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Meiosis increases genetic variability in a population.
Reason (R): Crossing over leads to recombination of genetic material on the two homologous chromosomes.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): Meiosis increases genetic variability in a population.
Reason (R): Crossing over leads to recombination of genetic material on the two homologous chromosomes.
In the light of the above statements, choose the correct answer from the options given below.
- (A) is true but (R) is false.
- (A) is false but (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is not the correct explanation of (A).
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Meiosis II resembles a normal mitosis.
Reason (R): In meiosis II, sister chromatids separate.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): Meiosis II resembles a normal mitosis.
Reason (R): In meiosis II, sister chromatids separate.
In the light of the above statements, choose the correct answer from the options given below.
- (A) is true but (R) is false.
- (A) is false but (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is not the correct explanation of (A).
General
✓✗The cell cycle of yeast is shorter than that of a human cell in culture. This shows that
- human cells have no M phase at all
- yeast cells do not replicate their DNA
- the duration of the cell cycle varies between organisms
- yeast cells have no interphase at all
General
✓✗Which of the following represents the best stage to view the shape, size and number of chromosomes?
- Interphase
- Prophase
- Telophase
- Metaphase
General
✓✗In diploid organisms, meiosis occurs during gametogenesis in
- specialised diploid cells
- red blood cells
- haploid cells only
- all somatic cells
General
✓✗Prophase is marked by the initiation of
- condensation of chromosomal material
- reformation of the nuclear envelope
- formation of the cell plate
- splitting of centromeres
General
✓✗The complete disintegration of the nuclear envelope marks the start of
- metaphase
- prophase
- anaphase
- telophase
General
✓✗Spindle fibres unite with which structure of chromosomes?
- Chromomere
- Centriole
- Kinetochore
- Chromocentre
General
✓✗Crossing over leads to
- recombination of genetic material on the two chromosomes
- loss of chromosomes from the daughter cells
- formation of the cell plate in plant cells
- doubling of the chromosome number in the cell
General
✓✗Spindle fibres attach to the kinetochores of chromosomes during
- metaphase
- telophase
- anaphase
- prophase
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Homologous chromosomes separate at anaphase I.
Reason (R): The centromeres split at anaphase I.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): Homologous chromosomes separate at anaphase I.
Reason (R): The centromeres split at anaphase I.
In the light of the above statements, choose the correct answer from the options given below.
- (A) is true but (R) is false.
- (A) is false but (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is not the correct explanation of (A).
General
✓✗In the S phase, which organelle duplicates in the cytoplasm of animal cells?
- Lysosome
- Nucleolus
- Golgi apparatus
- Centriole