Q.1. Golgi complex and endoplasmic reticulum cannot be seen during

1. late telophase
2. late prophase
3. early anaphase
4. late metaphase

Answer: (b) late prophase
Explanation: Cells, when viewed under microscope at the end of prophase, do not show golgi complex, endoplasmic reticulum, nucleolus and nuclear envelope.

Q.2. Cell plate grows from

1. walls to the centre
2. centre to the walls
3. in patches
4. simultaneously

Answer: (b) centre to the walls
Explanation: Cell plate grows during cytokinesis from centre to the walls

Q.3. Choose the correct sequence. A. Chromatin condensation B. Protein synthesis C. Duplication of centrioles D. Centrioles moves towards opposite poles

1. C, A, B, D
2. C, B, A, D
3. C, D, B, A
4. A, C, D, B

Answer: (b) C, B, A, D
Explanation: Duplication of centrioles occurs in S-phase.Protein synthesis occurs in G2 phase.chromatin condensation is followed by centrioles movement towards the poles. (Prophase)

Q.4. 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. Prophase
2. Anaphase
3. Telophase
4. Metaphase

Answer: (d) Metaphase

Q.5. Karyokinesis is the term used for

1. division of cytoplasm
2. division of nucleoplasm
3. division of nucleus
4. separation of daughter chromosomes

Answer: (d) separation of daughter chromosomes
Explanation: Karyokinesis means separation of daughter chromosomes.Cytokinesis means division of cytoplasm

Q.6. During which stage the chromosomes first become visible

1. Anaphase
2. Metaphase
3. Prophase
4. Telophase

Answer: (c) Prophase

Q.7. In mitosis, nuclear envelope and nucleolus disappear during

1. Metaphase
2. Interphase
3. Prophase
4. Telophase

Answer: (c) Prophase

Q.8. Arrange the following events of meiosis in the correct sequence: I. Terminalization II. Crossing over III. Synapsis IV. Disjunction of genomes The correct sequences

1. II, I, IV, III
2. III, II, I, IV
3. IV, III, II, I
4. I, IV, III, II

Answer: (b) III, II, I, IV
Explanation: III, II, I, IV

Q.9. The major event that occurs during the anaphase of mitosis, which brings about the equal distribution of chromosomes, is

1. splitting of the centromeres
2. splitting of the chromatids
3. replication of the genetic material
4. condensation of the chromatin

Answer: (a) splitting of the centromeres

Q.10. what type of plant is formed when colchicine is used in the process of development of Raphanobrassica?

1. Autotetraploid
2. Haploid
3. Triploid
4. Allotetraploid

Answer: (d) Allotetraploid

Q.11. Meiosis occurs for the human female in ______.

1. Pancreas
2. Liver
3. Ovary
4. Kidney

Answer: (c) Ovary

Q.12. Choose the correct sequence. A. Pachytene B. Zygotene C. Leptotene D. Diakinesis E. Diplotene

1. C, B, A, D, E
2. C, A, B, E, D
3. C, B, A, E, D
4. D, B, C, E, A

Answer: (c) C, B, A, E, D
Explanation: These are the five phases of prophase I of Meiosis I based on the chromosomal behaviour

Q.13. How many chromosomes are there in onion root tip cell?

1. 6
2. 16
3. 26
4. 36

Answer: (b) 16
Explanation: There are 16 chromosomes in onion root tip cell.

Q.14. Lampbrush chromosomes are observed in

1. Mitotic prophase
2. Mitotic metaphase
3. Meiotic metaphase
4. Meiotic prophase

Answer: (d) Meiotic prophase

Q.15. Which of the following cellular structures always disappears during mitosis and meiosis?

1. Plasma membrane
2. Nucleolus and nuclear envelope
3. Plastids
4. none of these

Answer: (b) Nucleolus and nuclear envelope

Q.16. Centromere is a constituent of

1. Ribosome
2. ER
3. Chromosome
4. Mitochondrion

Answer: (c) Chromosome
Explanation: Chromosome

Q.17. In which phase of cell cycle, proteins are synthesised?

1. G0
2. G1
3. G2
4. S

Answer: (c) G2
Explanation: In G2 phase of cell cycle, proteins are synthesised for mitosis and cell growth continues

Q.18.

1. Early prophase
2. Early metaphase
3. Early telophase
4. Early anaphase

Answer: (b) Early metaphase
Explanation: Chromosomes are positioning towards the equator.

Q.19. The stage in which daughter chromosomes move toward the poles of the spindle is

1. Anaphase
2. Metaphase
3. Prophase
4. Telophase

Answer: (a) Anaphase

Q.20. Synaptonemal complex dissolves in _____ stage.

1. Zygotene
2. Pachytene
3. Diakinesis
4. Diplotene

Answer: (d) Diplotene
Explanation: Synaptonemal complex dissolves in diplotene stage of Prophase I.

Q.21. Synapsis occurs between

1. A male and female gametes
2. Ribosome and m-RNA
3. Spindle fibres and centromeres
4. Two homologous chromosomes

Answer: (d) Two homologous chromosomes
Explanation: Two homologous chromosomes

Q.22. Division of nucleus without being followed by cytokinesis results into

1. Phargmoplast
2. Polyploidy
3. Uninucleate condition
4. Multinucleate condition

Answer: (d) Multinucleate condition

Q.23. A cell plate is laid down during

1. Cytokinesis
2. Interphase
3. Karyokinesis
4. None of these

Answer: (a) Cytokinesis
Explanation: Cytokinesis

Q.24. Crossing over results the exchange of genetic material, which occurs between

1. Non-sister chromosomes
2. Sister chromatids
3. Non-homologous chromosome
4. Homologous chromosomes

Answer: (d) Homologous chromosomes

Q.25. The number of chromosome and the amount of DNA are changed in

1. Metaphase and M phase
2. Anaphase and S phase
3. Interphase and S phase
4. None of these

Answer: (b) Anaphase and S phase
Explanation: Anaphase and S phase