MCQs-10 (PGRs)

1)    What is the mode of action of Paclobutrazol?

a.      Anti auxin  

b.     Anti gibberellins  

c.      Auxin

d.     Gibberellins

2)    Recently for which crop paclobutrazol has used extensively?

a.      Mango       

b.     Banana

c.      Guava        

d.     All    

3)    What is the most efficient method of application of paclobutrazol?

a.      Spraying on foliage        

b.     Paste form

c.      Dipping the foliage

d.     Soil drenching

4)    Paclobutrazol helps in enhancing which type of growth?

a.      Juvenile

b.     Reproductive

c.      Vegetative

d.     Fruit set

5)         What is the correct stage of the plant to apply paclobutrazol?

a.      Before flowering  

b.     At flowering

c.      At fruit development stage

d.     After flowering

6)    The bushy nature of the plant can be controlled by which group of PGR?

a.      Gibberellins

b.     Cytokinins

c.      Auxins

d.     ABAs

7)    Auxin is produced from which region of plants?

a.      Apical meristem  

b.     Young growing tip

c.      Young leaves

d.     All

8)    What is the precursor for the synthesis of Auxin?

a.      Tryptophan

b.     Isopentyl pyrophosphate

c.      Mevalonic acid

d.     Methionine

9)    2, 4-D at lower concentration acts as _____ and at higher concentration as _____.

a.      Auxin, fungicide  

b.     Herbicide, auxin

c.      Weedicide, fungicide

d.     Auxin, herbicide  

10)            Tryptophan is derived from which pathway?

a.      Mevalonic acid    

b.     Sikkimic acid

c.      Photosynthetic     

d.   Electron Transport Chain

ANSWERS: 1-b, 2-a, 3-d, 4-b, 5-a, 6-d, 7-d, 8-a, 9-d, 10-b