Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

51.

The checkpoint in cell cycle plays important role in

  • repair DNA damage

  • apoptosis initiation

  • assess DNA damage

  • inhibit cell damage.


52.

Barr Body is found in the cytoplasm during

  • interphase in cell of female mammal

  • interphase in cell of male mammal

  • prophase in cell of female mammal

  • prophase in cell of male mammal.


53.

Which is the longest phase of the cell cycle

  • M-phase

  • interphase

  • Leptotene

  • S-phase


54.

In a diploid cell, at which stage of cell cycle, the amount of DNA is doubled?

  • G1 and G2 phase

  • G0 phase

  • S, G2 and M phase

  • S phase


Advertisement
55.

Microtubule depolymerizing drug such as colchicine is expected to

  • inhibit spindle formation during mitosis

  • inhibit cytokinesis

  • allow mitosis beyond metaphase

  • induce formation of multiple contractile rings


56.

Which of the following statements is incorrect about G0 phase

  • Mitosis occurs after G0 phase.

  • Biocatalysts can be used to exit G0 phase.

  • Cell volume keeps on increasing during this phase.

  • Cell metabolism occurs continuously in G0 phase.


57.

Assertion: Meiosis II is similar to mitosis.

Reason : Meiosis I cannot occur in haploid cells.

  • If both assertion and reason are true and reason is the correct explanation.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false

  • If both assertion and reason are false.


58.

Which of the following is not a characteristic of meiosis

  • It involves two stages of DNA replication one before meiosis-I and another before meiosis-II

  • It involves recombination and crossing over

  • Sister chromatids separate during anaphase II

  • Nuclear membrane disappears during prophase.


Advertisement
Advertisement

59.

When synapsis is complete all along the chromosome, the cell is said to have entered a stage called

  • zygotene

  • pachytene

  • diplotene

  • diakinesis


B.

pachytene

Prophase I consists of 5 stages:

(i) Leptotene- Chromosomes become gradually visible.

(ii) Zygotene- Synapsis, pairing of homlogous chromosomes takes place. It results in the formation of bivalents. Also, formation of special proteinaceous structure called synaptonemal complex occur.

(iii) Pachytene- Cells that eneterd this phase results in spiralling, shortening and thickening of the bivalents.

(iv) Diplotene- Dissolution of synaptonemal complex takes place. Also, recombined homologous chromosomes of the bivalents seperate.

(v) Diakinesis- Terminalisation of chiasmata occur in this phase.


Advertisement
60.

The importance of meiosis lies in :

  • bringing discontinuous variations

  • addition in the number of chromosomes

  • reduction in the number of chromosomes

  • maintaining the number of chromosomes


Advertisement