Chapter 10

Condensation of chromosome with visible centromere occurs during (a) \(\mathrm{G}_{1}\) phase (b) \(\mathrm{G}_{2}\) phase (c) S-phase (d) M-phase

Synthesis of RNA and proteins takes place in (a) M-phase (b) S-phase (c) \(\mathrm{G}_{1}\) phase (d) \(\mathrm{G}_{1}\) and \(\mathrm{G}_{2}\) phases

Mitosis is (a) Karyokinesis (b) Cytokinesis (c) Reduction in chromosome number (d) Both (a) and (b)

As compared to meiosis, in mitosis (a) Homologous chromosomes form pairs (b) Daughters have half chromosome number (c) Telophase stage is absent (d) Prophase is shorter

The cellular structure which always disappears during mitosis or meiosis is (a) Plastids (b) Plasma membrane (c) Nucleolus and nuclear envelope. (d) None of these

Chromosomes are arranged at equatorial plate of division spindle in (a) Prophase (b) Metaphase (c) Anaphase (d) Telophase

Chromosomes can be counted best at the stage of (a) Prophase (b) Anaphase (c) Metaphase (d) Telophase

The best stage to observe the shape, size and number of chromosomes is (a) Interphase (b) Metaphase (c) Prophase (d) Telophase

Spindle fibres are made up of (a) Proteins (b) Lipids (c) Cellulose (d) Pectin

Mitotic spindle is mainly composed of the protein (a) Actin (b) Actomyosin (c) Tubulin (d) Myoglobin

The separation of daughter chromosomes occurs in (a) The beginning of anaphase (b) Metaphase (c) Late prophase (d) Early prophase

At which stage of mitosis, the chromatids separate and start moving towards poles? (a) Prophase (b) Metaphase (c) Anaphase (d) Telophase

Mitotic anaphase differs from metaphase in possessing (a) Same number of chromosomes and half number of chromatids. (b) Half the number of chromosomes and same number of chromatids. (c) Half the number of chromosomes and half number of chromatids. (d) Same number of chromosomes and same number of chromatids.

Animal cells undergo cytokinesis by (a) Furrowing (b) Cell plate (c) Both (a) and (b) (d) Furrowing and followed by the deposition of special materials

Significance of mitosis lies in (a) Producing cells genetically similar to parent cell (b) Occurrence in energy tissue of body (c) Increasing cellular mass (d) Swift division

Mitosis differs from meiosis in (a) Forming four haploid cells. (b) Pairing of homologous chromosomes and their subsequent separation. (c) Doubling of each chromosome and each pair showing four chromatids. (d) Duplication of chromosomes and subsequent separation of the duplicates.

Meiosis occurs in (a) Liver (b) Kidney (c) Gonad (d) Brain

Meiosis is (a) Disjunctional division (b) Equational division (c) Multiplicational division (d) Reductional division

Meiosis involves (a) Two nuclear divisions and two chromosome divisions (b) Two nuclear divisions and one chromosome division (c) One nuclear division and one chromosome division (d) One nuclear division and two chromosome divisions

Meiosis occurs in (a) Haploid cells (b) Diploid cells (c) Both haploid and diploid cells (d) Triploid cells

Which of the following statements is correct for meiosis? (a) First division is equational and the second is reductional (b) First division is reductional and the second is equational (c) Both divisions are equational (d) Both divisions are reductional

Meiosis can be studied in angiosperm in (a) Root apical meristem (b) Shoot apical meristem (c) Dividing cells of vascular cambium (d) Dividing pollen mother cells in anther

How many meiotic divisions are necessary to produce 600 pollen grains? (a) 50 (b) 100 (c) 150 (d) 300

Before undergoing meiosis, the amount of DNA of a cell (a) Halves (b) Doubles (c) Remains the same (d) Quadruples

Which of the following represents the correct order in Prophase I? (a) Zygotene, diplotene, pachytene, leptotene, diakinesis (b) Diakinesis, diplotene, leptotene, pachytene, zygotene (c) Leptotene, zygotene, pachytene, diplotene, diakinesis (d) Pachytene, leptotene, zygotene, diplotene, diakinesis

In which stage of meiosis, the chromosome is thin, long and thread-like? (a) Leptotene (b) Zygotene (c) Pachytene (d) Diakinesis

Synaptonemal complex has a role in (a) Chromosome pairing (b) Chromosome movement (c) Chromosome segregation (d) Chromosome organization

The synaptonemal complex is formed during (a) Cytokinesis (b) Amitosis (c) Mitosis (d) Meiosis

Bivalents are formed during (a) Diplotene (b) Pachytene (c) Zygotene (d) Leptotene

Tetrad is made of (a) Four non-homologous chromatids (b) Four non-homologous chromosomes (c) Four homologous chromosomes with four chromatids (d) Two homologous chromosomes and each with two chromatids

The exchange of paternal and maternal chromosome material during cell division is (a) Dyad formation (b) Crossing over (c) Synapsis (d) Bivalent formation

Transfer of genes from one chromosome to another and vice versa during synapsis is called (a) Crossing over (b) Exchange (c) Chiasmata (d) Translocation

Repulsion of homologous chromosomes takes place in (a) Diplotene (b) Zygotene (c) Diakinesis (d) Leptotene

When are chromatids clearly visible in meiosis? (a) Zygotene (b) Pachytene (c) Diplotene (d) Diakinesis

Chiasma formation occurs in (a) Leptotene (b) Zygotene (c) Pachytene (d) Diplotene

Cross-like configuration when non-sister chromatids of a bivalent comes in contact during the first meiotic division are (a) Chiasmata (b) Bivalents (c) Chromomeres (d) Centromeres

Terminalization occurs during (a) Mitosis (b) Diakinesis (c) Cytokinesis (d) Meiosis II

Number of chromosome groups at equatorial plate of metaphase I of a plant body having \(2 n=50\) chromosomes shall be (a) 100 (b) 75 (c) 50 (d) 25

In meiosis I, the centromere undergoes (a) No division (b) Division between anaphase and interphase (c) Division between prophase and metaphase (d) Division but the daughter chromosomes do not separate

Meiosis II performs (a) Synthesis of DNA and centromere (b) Separation of sex chromosomes (c) Separation of chromatids (d) Separation of homologous chromosomes

Significance of meiosis lies in the (a) Reduction of chromosome number to one half. (b) Maintaining the consistency of chromosome number during sexual reproduction. (c) Production of genetic variability. (d) All of these

200 egg cells are produced by (in meiosis) (a) 50 divisions (b) 100 divisions (c) 200 divisions (d) 400 divisions

A cell has 23 pairs of chromosomes just after the completion of mitotic telophase. The number of chromatids at the preceding metaphase was (a) 23 (b) 46 (c) 69 (d) 92

In plant cells, cytokinesis occurs by (a) Furrowing (b) Invagination (c) Anticlinal division (d) Cell plate formation

The phase of cell cycle during which 'DNA polymerase' is functionally active is (a) \(\mathrm{S}\) (b) \(\mathrm{G}_{2}\) (c) \(\mathrm{G}_{1}\) (d) \(\mathrm{M}\)

The number of mitotic divisions required to produce 128 cells from a single cell is (a) 7 (b) 14 (c) 8 (d) 36

Which statement is correct for meiosis? (a) Meiosis \(\mathrm{I}\) is reduction division (b) Meiosis II is reduction division (c) Meiosis I and II are both reduction divisions (d) Meiosis I and II both are not reduction divisions

Which of the following is the longest phase of meiosis? (a) Prophase I (b) Anaphase (c) Prophase II (d) Metaphase II

\(\mathrm{G}_{1}\) phase is (a) End of mitosis and the start of S-phasc (b) End of S-phase and the start of mitosis (c) Start of S-phase and the start of mitosis (d) End of S-phase and the end of mitosis

At which stage of mitosis the chromatids separate and pass to different poles? (a) Prophase (b) Metaphase (c) Anaphase (d) Telophase