NEET UG Botany-124

Question No:1

(A): Growth of organism is caused by mitosis
(R): Mitosis occurs actively in meristematic cells.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:2

(A): Variations occur in sexually reproducing organisms
(R): Crossing over and disjunction occur during meiosis in sexual reproduction

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:3

(A):Metaphase chromosome contains two chromatids
(R):DNA duplicates in G1 phase.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:4

(A): DNA replication does occur between Meiosis -1 and Meiosis – II
(R):In Meiosis nucleus divides once but chromosomes divide twice

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:5

(A): Daughter cells formed through mitosis are qualitatively identical with their mother cell
(R): Genetic integrity is conserved due to mitosis as it doesn’t involve new gene combinations.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:6

(A): Meiosis must occur somewhere in the life cycle of all sexually reproducing eukaryotic organisms.
(R):Meiosis reduces the chromosomes number of an organism to exactly half.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:7

(A): During meiosis homologous chromosomes are separated in Anaphase – I.
(R): During meiosis the two chromatids of a chromosome are separated in Anaphase-II

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:8

(A):In sexually reproducing eukaryotic organisms meiosis takes place at one stage or the other
(R): All the daughter cells formed as a result of meiosis contain same number of chromosomes.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:9

(A) : Mitosis is called homeotypic division
(R):Two daughter cells formed are quantitatively and quantitatively identical

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:10

(A): Meiosis maintains constant number of chromosomes throughout the generations and also help in evolution.
(R):In meiosis, chromosome number is reduced and recombinations of genes take place

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:11

(A):The daughter cells of meiosis are qualitatively and quantitatively different
(R): Homologous chromosomes of bivalents get separated in anaphase-I of meiosis

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:12

(A): Chromatids of a chromosomes of pro-phase-II are not exactly the same as those of a chromosome of early prophase-I
(R):Crossing over which occurs in mid prophase-I brings about a change in the genetic constitution of the chromatids.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:13

(A): In Meiosis -1 the chromosome number is reduced to half
(R): Disjunction of chromosomes (genomes) occurs during Anaphase – I

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:14

(A): Crossing over is responsible for the origin of new strains or species which leads to evolution
(R): Crossing over results in the recombination of genetic characters causing variations in the progeny

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:15

(A): In Diakinesis, the chiasmata lie very close to telomeres of the homologues
(R): In Diakinesis, bivalents move to the periphery of the nucleus

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:16

(A): Genomes are separated during Anaphase II of Meiosis.
(R): Bivalents are pulled to the poles in a process called disjunction.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:17

Match the following:
List-I –List-II
A) Mitosis I) Megaspore mother cell
B) Meiosis II) Endonuclease
C)Pachytene III) Division of centromeres
D) Anaphase IV) Generative cell

ABCD

(A) II III I IV
(B) I IV II IE
(C) III I IV II
(D) IV I II III

Question No:18

Choose the correct match:
List-I—- List-II
A)Zygote née I) Crossing over
B)Pachytene II) Terminalization
C) Diplonema III) Formation of bivalent
D)Diakinesis IV) Repulsion of paired chromosomes

ABCD

(A) I III II IV
(B) III I IV II
(C) II IV III I
(D) IV II I III

Question No:19

Identify the correct sequence of the following phases during cell cycle
I) M – phase
II) S – subphase
III) G2 – subphase
IV) G1 – subphase

(A) IV, II, III, I
(B) I, IV, II, m
(C) IV, III, II, I
(D) II, IV, III, I

Question No:20

Find out the correct sequence of events during meiosis
I) Disjunction
II) Crossing over
III) Synapsis

IV) Terminalisation

(A) III, II, I, IV
(B) III, II, IV, I
(C) II, III, I, IV
(D) III, IV, II, II