MCQs on Role of Plant Hormones in Seed Germination and Dormancy for ICAR (SRF or JRF) /ASRB /CSIR NET/BET Exams #1

 

1. The term Auxin was coined by:
   (a) Skoog
   (b) Haberlandt
   (c) Miescher
   (d) F.W. Went

2. Precursor of indole acetic acid (IAA) is:
   (a) Glycine
   (b) Methionine
   (c) Isopentynyl pyrophosphate
   (d) Tryptophan

3. All the following hormones are growth inhibitors except:
   (a) Abscisic acid
   (b) Dormin
   (c) Ethylene
   (d) IAA

4. Which of the following is a gaseous hormone:
   (a) IBA
   (b) NAA
   (c) Abscisic acid
   (d) Ethylene

5. Which of the following is widely used as a rooting hormone:
   (a) NAA
   (b) 2,4-D
   (c) 2,4,5-T
   (d) Cytokinin

6. ‘Agent Orange’, the leaf defoliator used by USA in Vietnam war, was:
   (a) Ethylene
   (b) 2,4-D and 2,4,5-T
   (c) 2,4-D and NAA
   (d) 2,4,5-T, NAA, and ethylene

7. All the following inhibit auxin transport (anti-auxin) except:
   (a) Cytokinin
   (b) α-naphthyl thalamic acid
   (c) 2,3,5-triiodobenzoic acid
   (d) Ethylene

8. Which of the following auxins is widely used as a selective weedicide:
   (a) IBA
   (b) 2,4-D
   (c) NAA
   (d) 2,4,5-T

9. All are synthetic auxins except:
   (a) NAA
   (b) IAA
   (c) 2,4-D
   (d) 2,4,5-T

10. Auxin transport is:
    (a) Polar
    (b) Non-polar
    (c) Symplast
    (d) Apoplast

11. Which of the following bioassays are used to detect the presence of auxin:
    (a) Avena curvature test and tobacco pith culture
    (b) Split pea stem curvature test and tobacco pith culture
    (c) Avena curvature test and split pea stem curvature test
    (d) Tobacco pith culture only

12. Which of the following is not a function of auxin:
    (a) Inducing dormancy
    (b) Enhancing cell division
    (c) Inducing callus formation
    (d) Maintaining apical dominance

13. Nodule formation is induced by:
    (a) IBA
    (b) IAA
    (c) Both a and b
    (d) NAA

14. All are natural auxins except:
    (a) IAA
    (b) Phenoxyacetic acid
    (c) Indole-3-acetic acid
    (d) NAA

15. Which of the following is an auxin receptor:
    (a) ETR1
    (b) CBP1
    (c) ABP1
    (d) GRE

16. Gibberellin was coined after a fungus called:
    (a) Gibberella fujikuroi
    (b) Gibberella gaditijirii
    (c) Gibberella acuminita
    (d) Gibberella Africana

17. All are functions of gibberellins except:
    (a) Promote cell division
    (b) Promote dormancy
    (c) Promote elongation of internode
    (d) Promote parthenocarpic fruit formation

18. Elongation of rosette plants is achieved by treatment with:
    (a) Auxin
    (b) Zeatin
    (c) Cytokinin
    (d) Gibberellins

19. ABA regulates:
    (a) Flowering
    (b) Dormancy
    (c) Ripening
    (d) Etiolation

20. During water stress, rise in ABA levels initially causes:
    (a) Stomatal opening
    (b) Stomatal closure
    (c) Reduced transpiration
    (d) Increased transpiration

21. The precursor of ethylene is:
    (a) Tryptophan
    (b) Serine
    (c) Methionine
    (d) Cysteine

22. Which of the following is an artificial ripening agent:
    (a) Ethaphone
    (b) 2,4-D
    (c) NAA
    (d) Ethylene

23. Which of the following is the precursor of cytokinin:
    (a) Adenine
    (b) Guanine
    (c) Cytidine
    (d) Thymine

24. All the statements are true regarding cytokinin except:
    (a) Promote cell division
    (b) Delay senescence
    (c) Induce dormancy
    (d) Counteract apical dominance

25. The first kinetin isolated by Miller was from:
    (a) Coconut endosperm
    (b) Maize grains
    (c) Herring sperm DNA
    (d) Wheat grains