NEET UG Botany-122

Question No:1

Which one is not possible due to mitosis?

(A) Wound healing
(B) Regeneration
(C) Grafting
(D) Reduction of chromosome number

Question No:2

When compared to G1 phase of mitosis quantity of DNA in nucleus of each daughter cell will be

(A) Half as much as in parent nucleus
(B) Same as much as in parent nucleus
(C) Twice as much as parent nucleus
(D) Highly variable

Question No:3

When 16 cells are formed from a single cell, how many times cells divide and how many cells are formed in the 3rd generation?

(A) 4 and 8
(B) 4 and 7
(C) 3 and 8
(D) 4 and 16

Question No:4

Number of meiotic cycles, occurring in a meiocyte

(A) 1
(B) 2
(C) 3
(D) Infinite

Question No:5

Meiosis in plant occurs, when there is a change from

(A) Gametophyte to sporophyte
(B) Sporophyte to sporophyte
(C) Sporophyte to gametophyte
(D) Gametophyte to gametophyte

Question No:6

Process which is antithetical to fertilization is

(A) Mitosis
(B) Meiosis
(C) Vegetative propagation
(D) Apomixis

Question No:7

Meiosis is chracterised by

(A) Two nuclear divisions with chromosomes divide twice
(B) Two times nuclear divisions (number of nuclear divisons is 3) with chromosomes dividing one time
(C) Two nuclear division with chromosome dividing 4 times
(D) One nuclear division with chromosome dividing one time

Question No:8

The subphases of prophase -I showing enlage-ment of nucleus and nucleolus respectively are

(A) Leptotene, Zygotene
(B) Zygotene, Pachytene
(C) Zygotene, Diplotene
(D) Leptotene, Diplotene

Question No:9

If each cell of the spore tetrad contains 4 chromosomes, how many pachytene tetrads are found in the meiocyte of that plant ?

(A) 2
(B) 8
(C) 4
(D) 16

Question No:10

Regions of crossing over are indicated cytologically by

(A) Chromomeres
(B) Chaismata
(C) Centromeres
(D) Telomeres

Question No:11

Enzymes which help in crossing over an

(A) Endonuclease and ligase
(B) Restriction endonuclease and ligase
(C) Endonuclease and exonuclease
(D) Polymerase and endonuclase

Question No:12

What is the ratio of the number of chromatids, chromosomes, bivalents and centromeres respectively in acell during metaphase-I ?

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

Question No:13

Chromosomes of the bivalent are fused (Joined) by their chiasmata near the telomeric ends during

(A) Pachytene
(B) Zygotene
(C) Metaphase-I
(D) Anaphase-I

Question No:14

Movement of bivalents towards the periphery of the nucleus and their movement towards equator of the meiocyte occur respectively during

(A) Diakinesis and anaphase I
(B) Diplotene and diakinesis
(C) Leptotene and diakinesis
(D) Diakinesis and metaphase

Question No:15

Genomes migrate to opposite poles by the end of

(A) Anaphase-I
(B) Telophase-I
(C) Diakinesis
(D) Cytokinesis

Question No:16

Number of meiotic divisions required to produce 100 seeds in an angiospermic plant is

(A) 25
(B) 50
(C) 100
(D) 125

Question No:17

During meiosis, when the paternal and maternal chromosomes brought together and separated respectively ?

(A) Zygotene & Anaphase-II
(B) Prophase – II & Anaphase -I
(C) Zygotene & Anaphase -I
(D) Leptotene & Telophase-I

Question No:18

Number of spindle apparatii formed during the formation of one hundred microspores from microsporemother cells is

(A) 25
(B) 75
(C) 50
(D) 100

Question No:19

How many reductional divisions are required to form 400 synergids ?

(A) 400
(B) 300
(C) 200
(D) 100