It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

1. Cytokinin and Abscisic acid

2. Auxin and Ethylene

3. Gibberellin and Cytokinin

4. Gibberellin and Abscisic acid

C₂H₄ or Ethylene are …...or derivative of….

1.Indol compounds

2.Gases

3.carotenoids

4.Terpenes

Cousins confirmed the release of a volatile substance from ripened oranges that

1.Hastened the ripening of already ripened bananas

2.Hastened the ripening of unripened banana

3.Slowed the ripening of unripened bananas

4.Slowed the ripening of oranges

Ethephon hastens the fruit ripening in tomatoes and apple and accelerates abscission in flowers and fruits. Above statement indicates that ethephon must release –

1. ABA                                                          
2. C₂H₄
3. IAA                                                          
4. GA₇

Which of the following is wrong?

1.ABA is Growth inhibiting regulator

2.Ethylene could fit either of the groups, inhibitors and activators.

3.Auxins, GA and Cytokinins are plant promoters

4.Ethylene is largely a promoter of growth activities

Which of the following hormones is common in both the categories of plant promoter and plant inhibitor?

1.GA

2.ABA

3.Auxin

4.Ethylene

Match the following :-

1. (i) (b), (ii) (a), (iii) (d), (iv) (c)

2. (i) (b), (ii) (a), (iii) (c), (iv) (d)

3. (i) (a), (ii) (b), (iii) (d), (iv) (c)

4. (i) (b), (ii) (d), (iii) (a), (iv) (c)

Thinning of cotton and promotion of femaleness in cucumber are physiological effects of PGR which 

Plant growth regulator, which promotes senescence and abscission of plant organs, is also related to which of the following physiological effects?

1. Thinning of cotton, cherry, and walnut

2. Overcome apical dominance

3. Early seed production in conifers

4. Formation of new leaves

The PGR used to initiate flowering and for synchronizing fruit-set in pineapples is:

1. Abscisic acid
2. Cytokinin
3. Auxin
4. Ethylene