CBSE Class 11 Biology Cell Cycle And Cell Division Worksheet Set 02

Important Questions for NCERT Class 11 Biology Cell Cycle and Cell Division

Question. In meiosis, division of centromere occurs during:-
(a) Interphase
(b) Anaphase - I
(c) Anaphase - II
(d) Metaphase - I
Answer.A

Question. Chromosomal morphology (Structure) is best observed at :-
(a) Prophase
(b) Metaphase
(c) Interphase
(d) Anaphase
Answer.B

Question. In meiosis, nuclear membrane and nucleolus disappear during :-
(a) Zygotene
(b) Pachytene
(c) Diakinesis
(d) Metaphase - I
Answer.A

Question. Which of the following not ocurs in Anaphase-I but occurs in Anaphase-II :-
(a) Condensation of chromosomes
(b) Poleward movement of chromosome
(c) Contraction of spindle fibers
(d) Splitting of centromere
Answer.D

Question. During G2 - phase a diploid cell contains the amount of DNA equal to a :-
(a) Diploid cell
(b) Tetraploid cell
(c) Haploid cell
(d) None of the above
Answer.B 

Question. In cell cycle, which stage is misnomerly called resting phase :-
(a) S-phase
(b) Telophase
(c) Cytokinesis
(d) Interphase
Answer.D

Question. How many chromosome shall be present in a diploid cell at mitotic anaphase if its egg cell has ten chromosome:-
(a) 10 (Ten)
(b) 20 (Twenty)
(c) 30 (Thirty)
(d) 40 (Forty)
Answer.D

Question. Separation of homologous chromosomes during Anaphase - I is called :-
(a) Synapsis
(b) Disjunction
(c) Nondisjunction
(d) Crossing over
Answer.B

Question. During cell division, spindle fibers attach to which part of chromosome :-
(a) Primary constriction
(b) Secondary constriction
(c) Telomere
(d) Satellite
Answer.A

Question. Division of centromere occurs in:-
(a) Prophase
(b) Metaphase
(c) Anaphase
(d) Telophase
Answer.C

Question. The enzyme recombinase is required at which stage of meiosis?
(a) Pachytene
(b) Zygotene
(c) Diplotene
(d) Diakinesis 
Answer. A

Question. The complex formed by a pair of synapsed homologous chromosomes is called
(a) bivalent
(b) axoneme
(c) equatorial plate
(d) kinetochore.
Answer. A

Question. During meiosis I, the chromosomes start pairing at
(a) zygotene
(b) pachytene
(c) diplotene
(d) leptotene.
Answer. A

Question. During gamete formation, the enzyme recombinase participates during
(a) metaphase I
(b) anaphase II
(c) prophase I
(d) prophase II.
Answer. C

Question. Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres.
(a) Metaphase I
(b) Metaphase II
(c) Anaphase I
(d) Anaphase II
Answer. C

Question. Synapsis occurs between
(a) mRNA and ribosomes
(b) spindle fibres and centromere
(c) two homologous chromosomes
(d) a male and a female gamete. 
Answer. C

Question. When paternal and maternal chromosomes change their materials with each other in cell division this event is called
(a) bivalent-forming
(b) dyad-forming
(c) synapsis
(d) crossing-over. 
Answer. D

Question. Which statement best explains the evolutionary advantage of meiosis?
(a) Meiosis is necessary for sexual reproduction.
(b) Genetic recombinations are possible from generation to generation.
(c) Meiosis alternates with mitosis from generation to generation.
(d) The same genetic system is passed on from generation to generation.
Answer. B

Question. Meiosis II performs
(a) separation of sex chromosomes
(b) synthesis of DNA and centromere
(c) separation of homologous chromosomes
(d) separation of chromatids. 
Answer. D

Question. Number of chromatids at metaphase is
(a) two each in mitosis and meiosis
(b) two in mitosis and one in meiosis
(c) two in mitosis and four in meiosis
(d) one in mitosis and two in meiosis. 
Answer. A

Question. In meiosis, the daughter cells differ from parent cell as well as amongst themselves due to
(a) segregation, independent assortment and crossing over
(b) segregation and crossing over
(c) independent assortment and crossing over
(d) segregation and independent assortment.
Answer. A

Question. Meiosis I is reductional division. Meiosis II is equational division due to
(a) pairing of homologous chromosomes
(b) crossing over
(c) separation of chromatids
(d) disjunction of homologous chromosomes.
Answer. C

Question. Select the correct option.
Column I                                                   Column II
A. Synapsis aligns homologous               (i) Anaphase II
chromosomes
B. Synthesis of                                      (ii) Zygotene
RNA and protein
C. Action of enzyme                              (iii) G2-phase
recombinase
D. Centromeres do not separate but       (iv) Anaphase I
chromatids move towards opposite
poles (v) Pachytene
(a) A-(i), B-(ii), C-(v), D-(iv)
(b) A-(ii), B-(iii), C-(iv), D-(v)
(c) A-(ii), B-(i), C-(iii), D-(iv)
(d) A-(ii), B-(iii), C-(v), D-(iv) 
Answer. D

More Questions

1. Define genome & cell cycle. What are the 2 basic phases of cell cycle?

2. What is karyokinesis and cytokinesis? What are the three phases of interphase? Explain.

3. What is the significance of Go stage of cell cycle?

4. With help of diagrams describe various events of different phases of mitosis.

5. Why is mitosis called equational division?

6. How does cytokinesis in plant cell differ from that in animal cell?

7. What is the significance of mitosis?

8. Can there be mitosis without DNA replicate in ‘S’ phase?

9. List the key features of meiosis and define meiosis. Draw stages of meiosis I & II.

10. Describe the following:

(a) homologous chromosomes (b) synapsis

(c) bivalent (d) chiasmata Draw a diagram to illustrate your answer.

11. List the features of : anaphase I, metaphase I, telophase I

12. What are the differences between: metaphase I & Metaphase of mitosis; anaphase I & anaphase of mitosis Give significance of meiosis.