Practice Corner MCQs

Question 1 of 106

1. Question

Amitosis usually occurs in

eukaryotic cells
prokaryotic cells
meristems
spore mother cells

Question 2 of 106

2. Question

Which one is the correct sequence of a cell cycle?

\(\mathrm{M} \rightarrow \mathrm{G}_2 \rightarrow \mathrm{G}_1 \rightarrow \mathrm{S}\)
\(\mathrm{S} \rightarrow \mathrm{G}_2 \rightarrow \mathrm{G}_1 \rightarrow \mathrm{M}\)
\(\mathrm{G}_1 \rightarrow \mathrm{S}^2 \rightarrow \mathrm{G}_2 \rightarrow \mathrm{M}\)
\(\mathrm{M} \rightarrow \mathrm{S}^2 \rightarrow \mathrm{G}_1 \rightarrow \mathrm{G}_2\)

Question 3 of 106

3. Question

Identify A, B, C and D in the given diagram depicting cell cycle and select the correct option.

\(\mathrm{A}-\mathrm{G}_0, \mathrm{~B}-\mathrm{G}_1, \mathrm{C}-\mathrm{S}, \mathrm{D}-\mathrm{G}_2\)
\( \mathrm{A}-\mathrm{G}_1, \mathrm{~B}-\mathrm{S}, \mathrm{C}-\mathrm{G}_2, \mathrm{D}-\mathrm{G}_0 \)
\( \mathrm{A}-\mathrm{G}_1, \mathrm{~B}-\mathrm{G}_0, \mathrm{C}-\mathrm{S}, \mathrm{D}-\mathrm{G}_2 \)
\( \mathrm{A}-\mathrm{S}, \mathrm{B}-\mathrm{G}_0, \mathrm{C}-\mathrm{G}_1, \mathrm{D}-\mathrm{G}_2 \)

Question 4 of 106

4. Question

Yeast cell divides once in approximately every

90 minutes
9 minutes
24 hours
24 days

Question 5 of 106

5. Question

Human cells in culture show a cell cycle to be completed in approximately

42 hours
24 hours
24 minutes
24 seconds

Question 6 of 106

6. Question

Which phase occupies the maximum part of cell cycle?

Mitotic phase
Meiotic phase
Interphase
Sphase

Question 7 of 106

7. Question

This phase of cell cycle is a period of intense synthesis and growth. It constitutes \(95 \%\) of the duration of cell cycle, It is

interphase
telophase
prophase
anaphase

Question 8 of 106

8. Question

Read the following statements about cell division and select the correct ones.
(i) M phase represents the phase when actual cell division occurs and I phase represents the phase between two successive M phases.
(ii) In the 24-hour average duration of cell cycle of a human cell, cell division proper lasts for only about an hour.
(iii) M phase constitutes more than \(95 \%\) of the duration of cell cycle.

(i) and (ii)
(ii) and (iii)
(i) and (iii)
(i), (ii) and (iii)

Question 9 of 106

9. Question

Which of the following phases of the cell cycle is not a part of interphase?

\(\mathrm{S}\)
\(G_1\)
\(G_0\)
\(\mathrm{M}\)

Question 10 of 106

10. Question

A cell cycle includes

interphase and \(\mathrm{M}\) phase
prophase, metaphase, anaphase and telophase
\(G_1, S\) and \(G_2\) phases
karyokinesis and cytokinesis

Question 11 of 106

11. Question

In which stage DNA replication takes place?

Metaphase
G–phase
S-phase
\(\mathrm{G}_2\)-phase

Question 12 of 106

12. Question

Synthesis of histone proteins occurs in

\(G_1\) phase
Sphase
anaphase
\(G_0\) phase

Question 13 of 106

13. Question

Select the incorrect statement regarding \(S\) phase of interphase.

It occurs between \(G_1\) and \(G_2\)
DNA replicates in the nucleus in this phase
Centrioles duplicate in the cytoplasm
As DNA is doubled, number of chromosomes also get doubles

Question 14 of 106

14. Question

Which of the following cannot be found during a study of cell cycle?

Diploid cells found in the \(G_0\) or \(G_1\) phase.
Cells with twice the normal DNA content in the early M phase.
Cells with chromosome number doubled in the S phase.
Cells with twice the normal DNA content in the \(G_2\) phase.

Question 15 of 106

15. Question

Cell would normally proceed to mitosis without interruption

once it has entered the \(S\) phase
once it has entered the \(G_2\) phase
at any time during cell division activity
none of these

Question 16 of 106

16. Question

The cells that do not divide further, exit \(G_1\) phase to enter an inactive stage called ____ of the cell cycle.

M stage
S stage of the cell cycle
[latex]G_2[/latex] stage
\(\mathrm{G}_0\) stage

Question 17 of 106

17. Question

Which of the following statements is correct?

Animals can show mitotic divisions in both haploid and diploid cells
After \(S\) phase the number of chromosomes becomes double i.e., \(2 n\) to \(4 n\)
During the \(\mathrm{G}_2\) phase, proteins are synthesised in preparation for mitosis while cell growth continues
S or synthesis phase marks the period during which RNA synthesis takes place.

Question 18 of 106

18. Question

In which of the following stages, a chromosome is minimum coiled?

Interphase
Metaphase
Prophase
Anaphase

Question 19 of 106

19. Question

Which of the following statements is correct regarding \(\mathrm{G}_0\) phase?

Mitogens are present in \(G_0\) phase.
Mitogens are present but energy rich compounds are absent.
Both mitogens and energy rich compounds are present.
Neither mitogens nor energy rich compounds are present.

Question 20 of 106

20. Question

Best material for studying mitosis in laboratory is

leaf tip
flower
root tip
gamete

Question 21 of 106

21. Question

Mitotic spindle is mainly composed of ____ proteins.

tubulin
actin
myosin
actomyosin

Question 22 of 106

22. Question

Mitotic apparatus is formed of

centrosomes and phragmoplasts
two asters with spindle fibres
single aster with phragmoplast
spindle fibres only

Question 23 of 106

23. Question

Centrosome undergo duplication during (i) of (ii), and begin to move towards opposite poles of the cell during (iii) stage of (iv).

(i) – S phase, (ii) – Interphase, (iii) – Prophase, (iv) – Mitosis
(i) – S phase, (ii) – Interphase, (iii) – Anaphase, (iv) – Mitosis
(i) – Prophase, (ii) – Mitosis, (iii) – Metaphase, (iv) – Mitosis
(i) – Prophase, (ii) – Mitosis, (iii) – Anaphase, (iv) – Mitosis

Question 24 of 106

24. Question

____ is the best stage to count the number and study the morphology of chromosomes.

Prophase
Metaphase
Anaphase
Telophase

Question 25 of 106

25. Question

______ is characterised by all the chromosomes coming to lie at the equator, with one chromatid connected by its kinetochore to spindle fibres from one pole and its sister chromatid connected by its kinetochore to spindle fibres from the opposite pole.

Prophase
Metaphase
Anaphase
Telophase

Question 26 of 106

26. Question

Read the following statements.
(i) In mitotic cell division chromosome number is halved.
(ii) Centromere is the point where two sister chromatids are held together.
(iii) The period between two successive mitotic divisions is known as telophase.
(iv) In \(\mathrm{G}_1\) phase of cell cycle protein and RNA are synthesised.
Which of the above given statements are correct?

(i) and (iii) only
(i) and (iv) only
(ii) and (iii) only
(ii) and (iv) only

Question 27 of 106

27. Question

You are provided with root tips of onion in your class and are asked to count the chromosomes, then which of the following stages would you prefer to look into?

Prophase
Anaphase
Metaphase
Interphase

Question 28 of 106

28. Question

During karyokinesis, the spindle fibres get attached to condensing chromosome at a highly differentiated region. This region is called as

chromomere
centriole
chromocentre
kinetochore

Question 29 of 106

29. Question

Identify the structures indicated by labels (i), (ii), (iii) and (iv) and select the correct option.

(i) – Chromatid, (ii) – Centriole, (iii) – Centromere, (iv) – Chromoseome
(i) – Chromoseome, (ii) – Centriole, (iii) – Centromere, (iv) – Chromatid
(i) – Chromatid, (ii) – Centromere, (iii) – Centriole, (iv) – Chromoseome
(i) – Chromoseome, (ii) – Centromere, (iii) – Centriole, (iv) – Chromatid

Question 30 of 106

30. Question

Which of the following statements is not correct regarding colchicine?

It prevents assembly of microtubules.
It inhibits chromosome replication.
It is an alkaloid.
It is called mitotic poison.

Question 31 of 106

31. Question

Colchicine is a cell poison which arrests cell division at ____ and can induce _____.

metaphase, parthenocarpy
anaphase, parthenocarpy
metaphase, polyploidy
anaphase, polyploidy

Question 32 of 106

32. Question

Spindle formation can be disrupted by exposing cell to the microtubule poison such as

high concentration of oxygen
vitamin A
cholesterol
colchicine

Question 33 of 106

33. Question

At which stage of mitosis, the two daughter chromatids separate from each other, migrate towards the opposite poles and are now referred to as chromosomes of the future daughter nuclei?

Prophase
Metaphase
Anaphase
Telophase

Question 34 of 106

34. Question

During anaphasic movements of chromosomes, ____ of each chromosome is/are towards the pole and ____ of the chromosome trail(s) behind.

centromere, arms
arms, centromere
chromatids, centromere
none of these

Question 35 of 106

35. Question

Select the correct match.

Quiescent phase \(-\mathrm{G}_2\) phase
Synthesis phase \(-G_1\) phase
Centromere splitting – Anaphase
Chromosomal condensation-Telophase

Question 36 of 106

36. Question

The separation of two chromatids of each chromosome at early anaphase is initiated by

the interaction of centromere with the chromosomal fibres
the elongation of metaphasic spindle
the force of repulsion between the divided kinetochores
all of these

Question 37 of 106

37. Question

Match column I with column II and select the correct option from the given codes.

\(
\begin{array}{|l|l|l|l|}
\hline & \text { Column I } & & \text { Column II } \\
\hline \text { A. } & \text { V-shaped at anaphase } & \text { (i) } & \text { Acrocentric chromosome } \\
\hline \text { B. } & \text { L-shaped at anaphase } & \text { (ii) } & \text { Metacentric chromosome } \\
\hline \text { C. } & \text { J-shaped at anaphase } & \text { (iii) } & \text { Telocentric chromosome } \\
\hline \text { D. } & \text { I-shaped at anaphase } & \text { (iv) } & \begin{array}{l}
\text { Sub-metacentric } \\
\text { chromosome }
\end{array} \\
\hline
\end{array}
\)

A-(iv), B-(ii), C-(i), D-(iii)
A-(ii), B-(iv), C-(i), D-(iii)
A-(ii), B-(iv), C-(iii), D-(i)
A-(iv), B-(iii), C-(ii), D-(i)

Question 38 of 106

38. Question

Which of the following is key event of anaphase of mitotic division?

Chromosomes are moved to spindle equator and get aligned through spindle fibres to both poles.
Centromeres split and chromatids separate.
Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements.
Both (b) and (c)

Question 39 of 106

39. Question

Select the incorrect match regarding mitotic cell division.
(i) Prophase – Chromosomes begin uncoil
(ii) Metaphase – Chromatids move apart
(iii) Telophase – The nuclear membrane reappears
(iv) Late – Each chromosome consists of two anaphase chromatids
(v) Interphase – Chromosomes are not distinct

(ii) and (iv) only
(i) and (iii) only
(ii), (iv) and (v) only
(i) and (v) only

Question 40 of 106

40. Question

What is true about telophase stage of mitosis?

Chromosomes lose their identity as discrete elements.
Chromosomes cluster at opposite spindle poles.
Nuclear envelope, nucleolus, Golgi complex and ER reform.
All of these

Question 41 of 106

41. Question

Identify the given stages of mitosis and select the correct option.

A – Prophase, B – Metaphase, C – Telophase, D – Anaphase
A – Metaphase, B – Anaphase, C – Prophase, D – Telophase
A – Anaphase, B – Metaphase, C – Prophase, D – Telophase
A – Prophase, B – Metaphase, C – Anaphase, D – Telophase

Question 42 of 106

42. Question

Which of the following shows the correct sequence of the given mitotic stages?

\(\mathrm{D} \rightarrow \mathrm{C} \rightarrow \mathrm{B} \rightarrow \mathrm{A}\)
\(\mathrm{C} \rightarrow \mathrm{B} \rightarrow \mathrm{D} \rightarrow \mathrm{A}\)
\(\mathrm{B} \rightarrow \mathrm{A} \rightarrow \mathrm{C} \rightarrow \mathrm{D}\)
\(\mathrm{C} \rightarrow \mathrm{B} \rightarrow \mathrm{A} \rightarrow \mathrm{D}\)

Question 43 of 106

43. Question

At which of the given stages of mitosis, chromosomes appear in V, L, J and I shapes.

A
B
C
D

Question 44 of 106

44. Question

Read the given statements which represent the features of the figures A, B, C and D. Match them correctly and select the correct option.
(i) Chromosomes appear like a ball of wool (spireme stage)
(ii) Reformation of nuclear envelope, nucleolus, Golgi complex and ER
(iii) Formation of equatorial plate
(iv) Splitting of centromeres

A-(iv), B-(iii), C-(i), D-(ii)
A-(iii), B-(iv), C-(i), D-(ii)
A-(ii), B-(iii), C-(i), D-(iv)
A-(iv), B-(ii), C-(iii), D-(i)

Question 45 of 106

45. Question

Match column I with column il and select the correct option from the given codes.

\(
\begin{array}{|l|l|r|l|}
\hline & \text { Column I } & & \text { Column II } \\
\hline \text { A. } & \begin{array}{l}
\text { Disintegration of nuclear } \\
\text { membrane }
\end{array} & \text { (i) } & \text { Anaphase } \\
\hline \text { B. } & \text { Appearance of nucleolus } & \text { (ii) } & \text { Prophase } \\
\hline \text { C. } & \text { Division of centromere } & \text { (iii) } & \text { Telophase } \\
\hline \text { D. } & \text { Replication of DNA } & \text { (iv) } & \text { S-phase } \\
\hline
\end{array}
\)

A-(ii), B-(iii), C-(i), D-(iv)
A-(ii), B-(iii), C-(iv), D-(i)
A-(iii), B-(ii), C-(i), D-(iv)
A-(iii), B-(ii), C-(iv), D-(i)

Question 46 of 106

46. Question

Which phase of mitosis is essentially the reverse of prophase in terms of nuclear changes?

S-phase
Anaphase
Telophase
Interphase

Question 47 of 106

47. Question

The given graph shows the change in DNA content during various phases (A to D) in a typical mitotic cell cycle. Identify the phases and select the correct option.

\(\mathrm{A}-\mathrm{G}_2, \mathrm{~B}-\mathrm{G}_1, \mathrm{C}-\mathrm{S}, \mathrm{D}-\mathrm{M}\)
\( \mathrm{A}-\mathrm{G}_2, \mathrm{~B}-\mathrm{S}, \mathrm{C}-\mathrm{G}_1, \mathrm{D}-\mathrm{M} \)
\( \mathrm{A}-\mathrm{G}_1, \mathrm{~B}-\mathrm{S}, \mathrm{C}-\mathrm{G}_2, \mathrm{D}-\mathrm{M} \)
\( \mathrm{A}-\mathrm{M}, \mathrm{B}-\mathrm{G}_1, \mathrm{C}-\mathrm{S}, \mathrm{D}-\mathrm{G}_2 \)

Question 48 of 106

48. Question

A cell’s division time is 1 minute. In 20 minutes, a culture tube (culture medium) is \(1 / 8^{\text {th }}\) filled with cells. When the tube will be fully filled?

21 minutes
60 minutes
23 minutes
160 minutes

Question 49 of 106

49. Question

Cytokinesis in an animal cell takes place by ____ method in ____ direction; while in a plant cell it occurs by ____ method in ____ direction.

furrowing, centrifugal, cell plate, centripetal
furrowing, centripetal, cell plate, centrifugal
cell plate, centrifugal, furrowing, centripetal
cell plate, centripetal, furrowing, centrifugal

Question 50 of 106

50. Question

If a tissue at a given time has 1024 cells, how many cycles of mitosis had the original parental single cell undergone?

512
10
1024
256

Question 51 of 106

51. Question

Spindle usually persists in the form of ____ during _____ method of cytokinesis.

phragmoplast, cleavage
phragmoplast, cell plate
cell plate, cell plate
cell plate, cleavage

Question 52 of 106

52. Question

Match column I with column II and select the correct option from the given codes.

\(
\begin{array}{|l|l|r|l|}
\hline & \text { Column I } & & \text { Column II } \\
\hline \text { A. } & \text { Division of nucleus } & \text { (i) } & \text { Interphase } \\
\hline \text { B. } & \text { Division of cytoplasm } & \text { (ii) } & \text { Cytokinesis } \\
\hline \text { C. } & \text { DNA replication } & \text { (iii) } & \text { Syncytium } \\
\hline \text { D. } & \begin{array}{l}
\text { Karyokinesis not followed by } \\
\text { cytokinesis }
\end{array} & \text { (iv) } & \text { Karyokinesis } \\
\hline
\end{array}
\)

A-(ii), B-(iv), C-(i), D-(iii)
A-(iv), B-(ii), C-(i), D-(iii)
A-(iv), B-(ii), C-(iii), D-(i)
A-(iii), B-(ii), C-(iv), D-(i)

Question 53 of 106

53. Question

The given diagram depicts cell plate method of cytokinesis in plant cells. Identify A, B and C.

A – Daughter nucleus, B – Phragmoplast, C – Vesicles
A – Daughter nucleus, B – Vesicles, C – Phragmoplast
A – Parent nucleus, B – Vesicles, C – Phragmoplast
A – Parent nucleus, B – Phragmoplast, C – Vesicles

Question 54 of 106

54. Question

Phragmoplast is related to

division of nucleolus
cell elongation
cytokinesis
assemblage of chromosomes at metaphase

Question 55 of 106

55. Question

The role of mitosis is not merely to divide a cell into two daughter cells but to ensure genetic continuity from one cell generation to another cell generation. The mechanism ensuring genetic continuity is

formation of cells with new chromosomes
formation of two daughter cells with different hybrid DNA
formation of two cells with identical DNA
halving the chromosome number between the two new cells

Question 56 of 106

56. Question

Pollen grain of plant has chromosome number 14 . What will be the chromosome number and DNA content of leaf cell of this plant during the following stages: \(G_1, S, G_2\) and Metaphase?

\(
\begin{array}{|c|c|c|c|c|c|c|c|c|}
\hline & {\text { G }_1} & {\text { G }_1} & {\text { S }} & {\text { S }} & {\text { G }_2} & {\text { G }_2} & {\text { Metaphase }} & {\text { Metaphase }} \\
\hline \text { options } & \text { Chr. } & \text { DNA } & \text { Chr. } & \text { DNA } & \text { Chr. } & \text { DNA } & \text { Chr. } & \text { DNA } \\
& \text { No. } & & \text { No. } & & \text { No. } & & \text { No. } & \\
\hline a & 28 & 2 n & 14 & n & 14 & 2 n & 28 & 2 n \\
\hline b & 28 & 2 n & 28 & 4 n & 28 & 4 n & 28 & 4 n \\
\hline c & 28 & 2 n & 14 & 2 n & 28 & 2 n & 28 & n \\
\hline d & 28 & n & 28 & n & 14 & n & 14 & n \\
\hline
\end{array}
\)

a
b
c
d

Question 57 of 106

57. Question

Meiosis consists of

two cell divisions without any DNA replication
two cell divisions in which chromosome number is reduced to half
two cell divisions with only two rounds of chromosome replication
a single cell division with chromosome replication

Question 58 of 106

58. Question

Which of the following is not the feature of meiosis?

Meiosis involves two sequential cycles of nuclear and cell division, meiosis I and meiosis II but only a single cycle of DNA replication
Meiosis I is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S-phase
Meiosis involves pairing of non-homologous chromosomes and recombination between them
Four haploid cells are formed at the end of meiosis II

Question 59 of 106

59. Question

Best material to study meiosis is

ovary
young anther
pollen grain.
root tip

Question 60 of 106

60. Question

The term “meiosis” was given by

Johannsen
Knoll and Ruska
A. Flemming
Farmer and Moore.

Question 61 of 106

61. Question

At which of the following stages, the chromosomes appear single, thin and thread like?

Leptotene
Zygotene
Pachytene
Diplotene

Question 62 of 106

62. Question

Zygotene of prophase-I is characterised by

chromomeres
synaptonemal complex
crossing over
terminalisation of chiasmata

Question 63 of 106

63. Question

Crossing over in diploid organisms is responsible for

dominance of genes
linkage between genes
segregation of alleles
recombination of alleles

Question 64 of 106

64. Question

Which of the following is correct regarding the given figure?

Number of pairs of homologous chromosomes -3 , Number of chromatids – 6 , Number of centromeres – 12
Number of pairs of homologous chromosomes – 3 , Number of chromatids – 12, Number of centromeres – 6
Number of pairs of homologous chromosomes -6 , Number of chromatids – 6 , Number of centromeres – 12
Number of pairs of homologous chromosomes – 6 , Number of chromatids – 12, Number of centromeres -6

Question 65 of 106

65. Question

The members of a homologous pair of chromosomes

are identical in size and appearance
contain identical genetic information
separate and move to opposite poles of the cell during mitosis
are found only in haploid cells

Question 66 of 106

66. Question

Which of the following correctly shows a pair of homologous chromosomes at the start of meiosis?

a
b
c
d

Question 67 of 106

67. Question

Which of the following is correct about bivalent?
(i) Bivalents are tetrads.
(ii) A bivalent means 4 chromatids and 2 centromeres.
(iii) One bivalent consists of 2 homologous chromosomes.
(iv) Bivalents form in zygotene.

(i), (ii), (iii) and (iv)
(iii) only
(iii) and (iv)
(iv) only

Question 68 of 106

68. Question

The process of crossing over is assisted by which of the following enzymes?

Endonuclease
Polymerase
Ligase
Both (a) and (c)

Question 69 of 106

69. Question

To build up food reserves in the cytoplasm, chromosomes become unfolded to start transcription of mRNA and rRNA, during which phase of meiosis I?

Diakinesis
Zygotene
Diplotene
Leptotene

Question 70 of 106

70. Question

At which stage, the homologous chromosomes separate due to repulsion, but are yet held by chiasmata?

Zygotene
Pachytene
Diplotene
Diakinesis

Question 71 of 106

71. Question

Diplotene stage of prophase-I is characterised by

dissolution of synaptonemal complex
separation of synapsed homologous chromosomes except at the site of crossovers
formation of X-shaped structures called chiasmata
all of these

Question 72 of 106

72. Question

Refer to the following statements describing prophase I of meiosis.
(i) Thin thread-like chromosomes with a beaded appearance
(ii) Appearance of recombination nodules
(iii) Formation of bivalents/tetrads
(iv) Terminalisation of chiasmata
(v) Appearance of chiasmata

Identify the different stages with respect to the above given features and select the correct option.

(i) – Leptotene, (ii) – Zygotene, (iii) – Pachytene, (iv) – Diplotene, (v) Diakinesis
(i) – Leptotene, (ii) – Zygotene, (iii) – Pachytene, (iv) – Diakinesis, (v) Diplotene
(i) – Leptotene, (ii) – Pachytene, (iii) – Zygotene, (iv) – Diakinesis, (v) Diplotene
(i) – Leptotene, (ii) – Pachytene, (iii) – Diplotene, (iv) – Zygotene, (v) Diakinesis

Question 73 of 106

73. Question

Refer to the following statements describing prophase I of meiosis.
(i) Thin thread-like chromosomes with a beaded appearance
(ii) Appearance of recombination nodules
(iii) Formation of bivalents/tetrads
(iv) Terminalisation of chiasmata
(v) Appearance of chiasmata

Arrange the given statements in the correct sequence of their occurrence during prophase I.

(i) \(\rightarrow\) (iii) \(\rightarrow\) (ii) \(\rightarrow\) (v) \(\rightarrow\) (iv)
(i) \(\rightarrow\) (ii) \(\rightarrow\) (iii) \(\rightarrow\) (iv) \(\rightarrow\) (v)
(i) \(\rightarrow\) (iv) \(\rightarrow\) (v) \(\rightarrow\) (ii) \(\rightarrow\) (iii)
(i) \(\rightarrow\) (iii) \(\rightarrow\) (ii) \(\rightarrow\) (iv) \(\rightarrow\) (v)

Question 74 of 106

74. Question

Match column I with column II and select the option from given codes.

\(
\begin{array}{|l|l|l|l|}
\hline & \text { Column I } & & \text { Column II } \\
\hline \text { A. } & \text { Synaptonemal complex } & \text { (i) } & \text { Pachytene } \\
\hline \text { B. } & \text { Recombination nodule } & \text { (ii) } & \text { Zygotene } \\
\hline \text { C. } & \text { Terminalisation of chiasmata } & \text { (iii) } & \text { Telophase I } \\
\hline \text { D. } & \text { Formation of dyad cell } & \text { (iv) } & \text { Diakinesis } \\
\hline
\end{array}
\)

A-(ii); B-(i); C-(iv); D-(iii)
A-(i); B-(ii); C-(iv); D-(iii)
A-(iii); B-(i); C-(iv); D-(ii)
A-(ii); B-(i); C-(iii); D-(iv)

Question 75 of 106

75. Question

The given figure shows a cell undergoing meiosis.

a
b
c
d

Question 76 of 106

76. Question

Identify the given figures showing meiotic phases and select the correct option.

A-Anaphase, B- Metaphase, C- Telophase
A-Metaphase I, B- Anaphase I, C- Telophase I
A-Metaphase II, B- Telophase II, C- Anaphase II
A- Anaphase I, B- Metaphase I, C- Telophase I

Question 77 of 106

77. Question

Disjunction refers to

the separation of homologous chromosomes at anaphase I
the type of chromosomal aberration in which there is loss of a part of a chromosome
the separation of non-homologous chromosomes during late metaphase I
modification of gene action by a nonallelic gene

Question 78 of 106

78. Question

Lampbrush chromosomes are seen in which typical stage?

Mitotic anaphase
Mitotic prophase
Mitotic metaphase
Meiotic prophase

Question 79 of 106

79. Question

Match column I with column II and select the correct option from the given codes.

\(
\begin{array}{|l|l|c|l|}
\hline & \text { Column I } & & \text { Column II } \\
\hline \text { A. } & \text { Chromosomes move to equator } & \text { (i) } & \text { Pachytene } \\
\hline \text { B. } & \begin{array}{l}
\text { Centromere splits and } \\
\text { chromatids move apart }
\end{array} & \text { (ii) } & \text { Zygotene } \\
\hline \text { C. } & \begin{array}{l}
\text { Pairing between homologous } \\
\text { chromosomes }
\end{array} & \text { (iii) } & \text { Anaphase } \\
\hline \text { D. } & \begin{array}{l}
\text { Crossing over between } \\
\text { homologous chromosomes }
\end{array} & \text { (iv) } & \text { Metaphase } \\
\hline
\end{array}
\)

A-(i), B-(ii), C-(iii), D-(iv)
A-(ii), B-(iii), C-(iv), D-(i)
A-(iv), B-(iii), C-(ii), D-(i)
A-(iii), B-(i), C-(iv), D-(ii)

Question 80 of 106

80. Question

During meiosis I, chromosome number

is reduced to half
doubles up
remains the same
either (a) or (b).

Question 81 of 106

81. Question

Refer to the given stages A, B, C and D of meiosis I and select the incorrect statement regarding them.

The last stage of A is diakinesis which is marked by terminalisation of chiasmata.
In stage B, microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes.
In stage C, homologous chromosomes separate, while sister chromatids remain associated at their centromeres.
In stage D, nuclear membrane and nucleolus disappear, cytokinesis follows and this is called as dyad of cells.

Question 82 of 106

82. Question

During meiosis I in humans, one of the daughter cells receives

only maternal chromosomes
a mixture of maternal and paternal chromosomes
same number of chromosomes as present in parent cell
none of these

Question 83 of 106

83. Question

The number of chromosomes is reduced to half during

mitosis
meiosis II
meiosis I
fertilisation

Question 84 of 106

84. Question

Four different steps that occur during meiosis are given in the following list:
(i) Complete separation of chromatids
(ii) Pairing of homologous chromosomes
(iii) Lining up of paired chromosomes on equator
(iv) Crossing over between chromatids
Select the correct sequential arrangement of the steps.

(ii), (iii), (iv), (i)
(iii), (ii), (iv), (i)
(ii), (iv), (iii), (i)
(iii), (i), (ii), (iv)

Question 85 of 106

85. Question

Select the incorrectly matched pair.

Phragmoplast – Persistent spindle
Reductional division – Meiosis I
Equational division – Meiosis II
Crossing over – Non-homologous chromosomes

Question 86 of 106

86. Question

Splitting of centromere and hence separation of chromatids occur during

anaphase of mitosis
anaphase of meiosis I
anaphase of meiosis I
both (a) and (c)

Question 87 of 106

87. Question

If gametes are produced after reduction division, they are termed as

coenogametes
mitogametes
pseudogametes
meiogametes

Question 88 of 106

88. Question

If \(2 n=4\), then identify the figures A, B and C, as per the following codes and select the correct option.

\(
\begin{array}{lll}
\text { Anaphase of meiosis I } & = & \text { (i) } \\
\text { Anaphase of mitosis } & = & \text { (ii) } \\
\text { Anaphase meiosis II } & = & \text { (iii) }
\end{array}
\)

A-(ii), B-(i), C-(iii)
A-(i), B-(ii), C-(iii)
A-(iii), B-(ii), C-(i)
A-(iii), B-(i), C-(ii)

Question 89 of 106

89. Question

What does (i) and (ii) represent in the given flowchart?

(i) \(=2 n\), (ii) \(=n\)
(i) \(=n\), (ii) \(=n\)
(i) \(=n\), (ii) \(=2 n\)
(i) \(=2 n\), (ii) \(=2 n\)

Question 90 of 106

90. Question

In the below sequence of figures showing different stages of cell division, the missing stage (ii) is

a
b
c
d

Question 91 of 106

91. Question

Read the given characteristics of stage ‘ \(X ‘\) of meiosis.
(i) Chromosomes are paired and occur in synaptonemal complex.
(ii) Recombination nodules are seen.
(iii) Crossing over takes place.
Which of the following represents stage ‘ \(X\) ‘?

a
b
c
d

Question 92 of 106

92. Question

While in mitosis, the daughter cells resemble each other and also the parent cell; in meiosis they differ not only from parent cell in having half the number of chromosomes, but also differ among themselves qualitatively in genetic constitution due to

segregation and crossing over only
independent assortment and segregation only
independent assortment and crossing over only
crossing over, independent assortment and segregation

Question 93 of 106

93. Question

Refer to the given figure and select the correct statement.

In stage B homologous chromosomes are interconnected and chromosomes occur in pairs.
Stage A is divisible into five substages
In stage D, chromosomes are not enclosed by a nuclear envelope
In stage C centromeres divide and chromosomes are single stranded

Question 94 of 106

94. Question

Refer to the given figure. Identify A, B and C and select the correct option.

A = Prophase I, B= Metaphase I, C= Anaphase I
A = Metaphase I, B = Prophase II, C= Anaphase II
A = Metaphase I, B = Metaphase II, C= Anaphase II
A= Prophase II, B= Metaphase II , C= Anaphase II

Question 95 of 106

95. Question

Refer to the given figure of cell division.

Which of the following options shows the previous stage of this process?

a
b
c
d

Question 96 of 106

96. Question

In which of the following ways are mitosis and meiosis similar?

Both have pairing of homologous chromosomes
Both are preceded by DNA replication
Both occur in all kinds of cells
Both include separation of paired chromosomes

Question 97 of 106

97. Question

At which phase of meiosis there are two cells, each with separated sister chromatids that have been moved to opposite spindle poles?

Anaphase II
Anaphase I
Metaphase II
Telophasel

Question 98 of 106

98. Question

An anther has 1200 pollen grains. How many PMCs must have been there to produce them?

1200
300
150
2400

Question 99 of 106

99. Question

Meiosis does not occur in

bacteria
cyanobacteria
plant cell
both (a) and (b)

Question 100 of 106

100. Question

In animals meiotic division occurs during gamete formation. This gametic meiosis results in

haplontic life cycle
diplontic life cycle
diplohaplontic life cycle
none of these

Question 101 of 106

101. Question

The given figure is a schematic break-up of the phases/ stages of cell cycle. Select the correct option regarding it.

' a ' represents karyokinesis which is the division of cytoplasm.
' b ' is telophase which is just reverse of prophase.
' c ' is the best phase to count total number of chromosomes in any species.
In 'd' stage, replication of DNA takes place on the template of the existing DNA.

Question 102 of 106

102. Question

Given diagram shows variations in the amount of DNA of a developing eukaryote. What the arrow denotes?

First meiotic anaphase
Second meiotic anaphase
Mitotic anaphase
Mitotic telophase

Question 103 of 106

103. Question

Which of the following graphs correctly depicts the amount of DNA present in the nucleus of a cell undergoing meiosis?
\(
\begin{aligned}
\text { Key: } P & =G_1 \text { stage, } Q=G_2 \text { stage, } \\
R & =\text { Telophase } I, S=\text { Telophase II }
\end{aligned}
\)

a
b
c
d

Question 104 of 106

104. Question

There are 7 chromosomes in each cell and 2C DNA after M-phase in a plant. Find out the correct match in the following table.

\(
\begin{array}{|c|c|c|c|}
\hline & \text { Stage } & \begin{array}{c}
\text { Chromosome } \\
\text { No. }
\end{array} & \text { DNA content } \\
\hline \text { A. } & \mathrm{G}_1 & 7 & 2 \mathrm{C} \\
\hline \text { B. } & \mathrm{S} & 14 & 4 C \\
\hline \text { C. } & \mathrm{G}_2 & 7 & 4 C \\
\hline \text { D } & \mathrm{M} & 7 & 2 \mathrm{C} \\
\hline
\end{array}
\)

A and B are correct
A, B and D are correct
A, C and D are correct
B, C and D are correct

Question 105 of 106

105. Question

Refer to the given graph and select the incorrect statement regarding it.

W could be energy phase which occupies \(75 \%-95 \%\) of the total generation time.
In X, the polar groups of chromosomes arrange themselves into dyad nuclei
In Y, the four groups of chromosomes arrange themselves into haploid nuclei
Centromeres do not divide during Y but do so in X

Question 106 of 106

106. Question

Study the given figures and select the correct option regarding them.

Two chromatids of each chromosome in fig X are genetically similar
Centromeres do not split during X but do so during Y
The chromosomes in fig X are referred to as bivalents or tetrads whereas the chromosomes in fig Y are known as univalents or dyads
The DNA content of chromosomes in fig X is half the DNA content of chromosomes in fig Y

CLASS-XI BIOLOGY + NEET

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