Question No:1

Ethephon accelerates abscission in flowers and fruits like

[A] Cherry
[B] Walnut
[C] Cotton
[D] All



Question No:2

How does ethephon increase the yield of cucumber?

[A] promote senescence
[B] promotes female flowers
[C] promotes male flowers
[D] both (a) and (b)



Question No:3

For which role ABA was discovered?

[A] Abscission
[B] Dormancy
[C] Both (a) and (b)
[D] Ripening fruits



Question No:4

What are the actions of ABA?

[A] General plant growth inhibitor
[B] Inhibitor of plant metabolism
[C] Stimulates closure of stomata in epidermis
[D] All



Question No:5

Why is ABA called stress hormone

[A] Removes various stresses from plant
[B] Increase tolerance of plant to various kind of stresses
[C] Both (a) and (b)
[D] None



Question No:6

ABA plays an important role in all except

[A] Seed development
[B] Maturation
[C] Dormancy
[D] Germination



Question No:7

What is/are the factors that are unfavorable growth of seeds?

[A] Desiccation
[B] Air
[C] Carbon dioxide
[D] All



Question No:8

ABA is antagonist to

[A] IBA
[B] IAA
[C] GA₂
[D] All



Question No:9

All are types of roles played by PGR except

[A] Individualistic
[B] Synergistic
[C] Both (a) and (b)
[D] None



Question No:10

Which of the following events are controlled by extrinsic factors via PGR?

[A] Vernalisation
[B] Flowering
[C] Dormancy
[D] All



Question No:11

All are extrinsic factors for growth and development except

[A] Temperature
[B] Light
[C] Both (a) and (b)
[D] Nutrition



Question No:12

What kind of plants require the exposure to light for a period exceeding a well defined critical duration?

[A] Short day plants
[B] Day-neutral plants
[C] Long day plants
[D] None



Question No:13

What kind of plants require the exposure to light for a period less than critical duration?

[A] Short day plants
[B] Day-neutral plants
[C] Long day plants
[D] None



Question No:14

Plants with no such correlation between exposure to light duration and induction of flower response are called

[A] Long day plant
[B] Day-neutral plants
[C] Short day plant
[D] None



Question No:15

What is more important of these?

[A] Light period
[B] Dark period
[C] Both (a) and (b)
[D] None