Biology Botany Questions Jipmer,Aiims,NEET UG Medical/Dental

NEET UG Botany-123

Question No:1

Chromosomes of the bivalent lie very close to each other and far separated from each other, respectively during

(A) Zygotene and diakinesis
(B) Leptotene and anaphase-I
(C) Leptotene and diplotene
(D) Anaphase I and anaphase -II

Question No:2

What happens when cytokinesis fails permanently after karyokinesis in mitosis ?

(A) Cell remains same
(B) Cell becomes coenocytic
(C) Cell becomes free nuclear
(D) Cell becomes dikaryotic

Question No:3

The ratio of chfomosomes moving to each pole during Anaphase-II to those moving to each pole during Anaphase-I

(A) 1 : 1
(B) 1 : 2
(C) 2 : 1
(D) 1 : 4

Question No:4

During meiosis spindle formation is initiated during

(A) Zygotene of Prophase-I
(B) Pachytene of Prophase-I
(C) Metaphase-I
(D) Interphase

Question No:5

During cell cycle, every chromosome contains two DNAmolecules from

(A) G1-subphase to Anaphase
(B) G2-subphase to Anaphase
(C) S-subphase to Metaphase
(D) S-subphase to Anaphase

Question No:6

If a bacterial cell divides once in every minute, it takes one hour to fill a cup. How much time will it take to fill half of the cup?

(A) 30 min
(B) 59 min
(C) 58 min
(D) 15 min

Question No:7

Meiosis is characterized by

(A) Two successive divisions of cytoplasm, nuclei and chromosomes
(B) Two successive divisions of cytoplasm and nuclei accompanied by one replication of DNA
(C) One division of cytoplasm and Nuclei accom-pained by Replication ofchromosomes twice
(D) One division of cytoplasm and Nuclei accompanied by replication of chromosomes once.

Question No:8

What type of cell division takes place in the functional megaspore initially in angiosperms?

(A) Homeotypic without cytokinesis
(B) Reductional without cytokinesis
(C) Somatic followed by cytokinesis
(D) Meotic followed by cytokinesis

Question No:9

In a flowering plant the largest number of haploid cells occurs in

(A) Ovule
(B) Microsporangium
(C) Root apex
(D) Cambium

Question No:10

Colchicine interferes with

(A) DNA replication
(B) Organization and orientation of spindle
(C) Chromosome condensation
(D) None of the above

Question No:11

Daughter cells formed as a result of meiosis are not similar to that of parent cell because

(A) Meiosis is completed in two stages
(B) Prophase is the longest phase
(C) Nucleus size increases in daughter cells
(D) Crossing over takes place and chromosome number is halved

Question No:12

(A):Division of nucleus is followed by the division of cytoplasm in free nuclear division.
(R): Functioning of Golgi Complex leads to free nuclear division.

(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) A is false and R is false

Question No:13

(A):Embryo formation is lacking in Thallophytes
(R): Meiosis occurs in the Zygote of Thallophytes

(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) A is false and R is false

Question No:14

(A): Meiosis is not antithetical to fertilization
(R): Fertilization doubles the chromosomes number and meiosis does not alter the chromosome number

(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) A is false and R is false

Question No:15

(A):In bacteria cell division results in reproduction
(R): Bacteria are generally unicellular organisms

(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):Event of pachytene leading to evolution is linkage and crossing over
(R):During crossing over, genetic material is exchanged between sister chromatids of homologous 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:17

(A)’.Events of telophase are reverse to those of metaphase
(R) rDuring prophase, nucleus appears and in telophase the nucleus disappears

(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:18

(A): Daughter chromosomes move to opposite poles in Anaphase
(R): During Anaphase, centromeres divide & spindle fibres contract.

(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:19

(A): During Anaphase-I, genomes segregate and move to opposite poles
(R): Centromeric division does not take place 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:20

(A): Daughter cells formed in mitosis are genetically identical
(R): Chromatids are formed in late prophase sub 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:21

(A): Chromosomes replicate once and nucleus divides twice during meiosis
(R): Chromosome number is reduced exactly to half by 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.