MCQ on Plant Sciences

 

1. Criss cross inheritance is seen by traits governed by recessive genes located on
   A. X chromosomes
   B. Y chromosomes
   C. Autosomes
   D. Allosomes

2. Relationship of the distance between the genes and recombination frequency is
   A. Positive
   B. Negative
   C. Not related
   D. Depends on the organism

3. Structural stability in chromosomes is ensured by
   A. Primary constriction
   B. Secondary constriction
   C. Centromere
   D. Telomere

4. If frequency of genotype aa = 0.16, then the frequency of the genotype Aa will be
   A. 0.24
   B. 0.48
   C. 0.12
   D. 0.16

5. Map distance between A–B is 20 map units and between B–C is 10 map units and observed double crossovers is 1.6 per cent, then the co-efficient of coincidence is
   A. 0.2
   B. 0.4
   C. 0.8
   D. 1.0

6. In eukaryotes, the RNA polymerase II core enzyme in association with which of the following factors forms the holo enzyme
   A. TF IIB
   B. TF IID
   C. Sigma factor
   D. TF IIF

7. What is the probability of obtaining A_bbC genotype when AabbCC × AaBbCC cross is made
   A. 3/64
   B. 9/64
   C. 1/64
   D. 8/64

8. Expected test cross genotypic ratio for a trait controlled by two genes interacting in a complementary fashion is
   A. 1:1:1:1
   B. 9:7
   C. 3:1
   D. 1:1:2

9. If chiasma frequency between two genes is 20%, the frequency of recombinant gametes recovered is
   A. 10%
   B. 20%
   C. <40%
   D. 50%

10. The production of doubled haploids in barley breeding was carried out in the species
    A. Hordeum spontaneum
    B. Hordeum bulbosum
    C. Hordeum agriocrithon
    D. Hordeum vulgare

11. Delayed ripening of fruits can be obtained through altering the
    A. Ethylene biosynthetic pathway
    B. β-carotene pathway
    C. Linolenic acid pathway
    D. None of these

12. In maize, modified ear-to-row method was proposed by
    A. Yuan Long Ping
    B. Longuist
    C. Swaminathan, M. S.
    D. Pustovit

13. Testers used for recurrent selection for GCA is
    A. Open pollinated variety
    B. An inbred variety
    C. A pure line variety
    D. A backcross variety

14. Lint index refers to
    A. Halo length
    B. Mean fibre length
    C. Ginning out turn
    D. Lint/Seed