Chapter 10

All organism starts its life with (a) Single cell (b) Many cells (c) Few cells (d) Few organs

The sequence of events by which a cell duplicates its genome, synthesize the other constituent of cells and eventually divides itself into two daughter cells is termed as (a) Cytology (b) Cell division (c) Cell cycle (d) Cell biology

Which of the following is correct about cell cycle? (a) All events occur in coordinated manner. (b) All events are under genetic control. (c) DNA synthesis occurs only during one specific stage in the cell cycle. (d) All of these

Cell growth (increase in cytoplasm) is a (a) Continuous process (b) Discontinuous process (c) Irregular process (d) Retrogressive process

Our cell can divide itself once approximately in (a) 24 hours (b) 24 minutes (c) 24 seconds (d) 24 days

Duration of a cell cycle in yeast is approximately (a) 90 seconds (b) 90 minutes (c) 20 minutes (d) 45 minutes

M-phase in human cell lasts for (a) 1 hour (b) 2 hours (c) 23 hours (d) 4 hours

Which of the following is correct about Interphase? (a) It is the phase present between two successive M-phase. (b) It lasts for more than 95 per cent in the duration of cell cycle in human cell. (c) It is also known as resting phase. (d) All the above

Select the correct matching: Column I Column II A. \(\mathrm{G}_{1}\) Phase - 1\. Gap 1 Phase B. Cytokinesis 2\. Nuclear division C. Karyokinesis 3\. Cytoplasmic division D. S phase 4\. Synthesis phase (a) \(\mathrm{B}-1, \mathrm{C}-2, \mathrm{~A}-3, \mathrm{D}-4\) (b) A-1, C-2, B-3, D - - (c) \(\mathrm{D}-1, \mathrm{C}-2, \mathrm{~B}-3, \mathrm{~A}-4\) (d) \(\mathrm{A}-1, \mathrm{D}-2, \mathrm{~B}-3, \mathrm{C}-4\)

\(\mathrm{G}_{1}\) phase is not characterized by (a) Continuous growth (b) Active metabolism (c) DNA replication (d) Non-replication of DNA

S-phase is not characterized by (a) DNA duplication (b) No increase in chromosome number (c) DNA replication (d) Duplication of centriole in nucleus of eukaryotic animal cell

What occurs continuously when cell is divided into \(\mathrm{G}_{1}, \mathrm{~S}\) and \(\mathrm{G}_{2}\) phase? (a) DNA Replication (b) DNA Duplication (c) Centriole duplication (d) Growth of cell

If a cell has \(2 n\) number of chromosome in \(\mathrm{G}_{1}\) phase, what is the number of chromosome in cell after S-phase? (a) \(n\) (b) \(4 n\) (c) \(2 n\) (d) \(8 n\)

The cells which do not divide enter \(\quad\) phase from \(\mathrm{G}_{1}\) phase. (a) S-phase (b) Directly \(\mathrm{G}_{2}\) -phase (c) \(\mathrm{G}_{0}\) -phase (d) Any one of these

\(\mathrm{G}_{0}\) phase is characterized by (a) DNA duplication (b) Active metabolism (c) S-phase (d) M-phase

Select the incorrect statement from the following: (a) In animals, mitotic cell division is only seen in the diploid somatic cells. (b) Plants can show mitotic division in both haploid and diploid cells. (c) In an adult's heart, the cells does not divide. (d) All organisms starts their life cycle from multiple cell.

Prophase is characterized by (a) Initiation of condensation of chromosomal material. (b) Centrioles moving towards opposite pole. (c) Initiation of the assembly of mitotic spindle. (d) All of these

Cells at the end of prophase, when viewed under the microscope, do not show (a) Golgi body and ER (b) Nucleolus (c) Nuclear envelop (d) All of these

Which of the following initiates the start of metaphase? (a) Completion of bivalent chromosome formation (b) Assemblage of microtubules of nucleoplasm (c) Complete disintegration of nuclear envelope (d) Duplication of chromosome

Metaphase is not characterized by (a) Complete condensation of chromosome (b) Alignment of chromosome on metaphase plants (c) Attachment of spindle fibre to kinetochore (d) Splitting of chromosome

Anaphase is characterized by (a) Splitting of centromere (b) Separation of chromatids (c) Movement of chromatid to opposite pole (d) All of these

Events of telophase are (a) Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements. (b) Nuclear envelope assembles around the chromosome cluster. (c) Nucleolus, Golgi complex and ER reforms (d) All the above

Furrow formation does not occur in plant cell during cytokinesis because of (a) Extensible cell wall (b) Inextensible cell wall (c) Extensible plasma membrane (d) Inextensible plasma membrane

Select the total number of correct statement: I. Cell-plate formation occurs in plant cell during cytokinesis. II. During cytokinesis mitochondria and plastid gets distributed between two daughter cells in mitosis. III. Liquid endosperm in coconut is syncytium. IV. Furrow formation occurs in Animal cell during cytokinesis (a) 1 (b) 2 (c) 3 (d) 4

Cell which divides by mitosis is (a) Upper layer of epidermis (b) Cells lining gut (c) Stem cells (d) All of these

Plant shows continuous growth throughout their life because of (a) Mitosis (b) Amitosis (c) Meiosis (d) All of these

Mitosis helps (a) Growth (b) Repair (c) Both (a) and (b) (d) None of these

Which of the following holds true about meiosis? I. It ensures the production of haploid phase in the life cycle of sexually reproducing organism where fertilization restores the diploid phase. II. It involves the two sequential cycle of nuclear and cell division called meiosis I and II but only a single cycle of DNA replication. III. It involves the pairing of homologous chromosomes and recombination between them. IV. Four haploid cells are formed at the end of meiosis. (a) I, II, IV only (b) IV only (c) I and III only (d) All of these

Prophase I is divided into how many phases based on the chromosomal behaviour? (a) 1 (b) 2 (c) 4 (d) 5

Synaptonemal complex formes in (a) Zygotene (b) Pachytene (c) Diplotene (d) Diakinesis

Select the correct statement from the following: (a) In leptotene stage the chromosomes become gradually visible under light microscope. (b) During zygotene the heterologous chromosome shows pairing. (c) Chiasmata is a J-shape structure formed in diplotene. (d) Pachytene is characterized by the formation of synaptonemal complex.

Recombination is seen in (a) Diplotene (b) Zygotene or synaptotene (c) Pachytene (d) Diakinesis

Synaptonemal complex is visible in (a) Compound microscope (b) Simple microscope (c) Hand lens (d) Electron microscope

Crossing over is an exchange of genetic material between (a) Homologous chromosome (b) Heterologus chromosome (c) Non-homologous chromosome (d) All of these

The beginning of diplotene is characterized by (a) Recombination (b) Synapsis (c) Dissolution of synaptonemal complex (d) Formation of tetrad

Diakinesis is characterized by (a) Condensation of chromosome (b) Assemblage of spindle (c) Disappearance of nucleous and nuclear membrane (d) All the above

Homologous chromosomes gets separate during (a) Metaphase-I (b) Anaphase-I (c) Anaphase-II (d) Telophase-I

The stage between two meiosis is (a) M-phase (b) Interphase (c) S-phase (d) Interkinesis

Which of the following statement is incorrect? (a) Prophase II is simpler than prophase I. (b) Prophase I is longer and complex than prophase of mitosis. (c) Nuclear membrane reappears in telophase I. (d) Anaphase II is not characterized by the splitting of centromere.

Meiosis is significant because it (a) Increases genetic variability (b) Helps in the conservation of specific chromosome number (c) Is important for evolution (d) All of these

Most of the cell organelle duplicates during (a) \(\mathrm{G}_{1}\) phase (b) S-phase (c) \(\mathrm{G}_{2}\) phase (d) M-phase

Reduction of the division is (a) Meiosis (b) Mitosis (c) Both (a) and (b) (d) None of these

The main difference between dividing an animal and plant cell lies in (a) Cell plate formation (b) Chromosome movement (c) Coiling of chromosome (d) Chromosome division

Which of the following cells do not divide once it is differentiated? (a) Interstitial cells (b) Nerve cells (c) Myeloid cells (d) Glial cells

Mitosis occurs in (a) Haploid cells only (b) Diploid cells only (c) Triploid cells only (d) Both (a) and (b)

Diploid somatic cells is divided by (a) Meiosis (b) Mitosis only (c) Both meiosis and mitosis. (d) None of these

Cell division takes place when the cell (a) Is haploid (b) Becomes diploid (c) Attains optimum growth (d) Any time

Before cell division, the entire DNA content of the cell gets doubled during interphase.This doubling takes place (a) Throughout the interphase (b) At the beginning of the interphase (c) At the end of the interphase (d) Somewhere during the middle of the interphase

Cell cycle is divisible into (a) karyokinesis and cytokinesis (b) Interphase and prophase (c) Interphase and mitotic phase (d) M-phase and S-phase

The correct sequence of stages in cell cycle is (a) \(\mathrm{G}_{1}, \mathrm{~S}, \mathrm{G}_{2}, \mathrm{M}\) (b) \(\mathrm{G}_{1}, \mathrm{G}_{2}, \mathrm{~S}, \mathrm{M}\) (c) \(\mathrm{M}, \mathrm{S}, \mathrm{G}_{1}, \mathrm{G}_{2}\) (d) \(\mathrm{G}_{2}, \mathrm{G}_{1}, \mathrm{M}, \mathrm{S}\)