1)Give the functions of following
A)Auxin
B) Cytokinin
C)Gibberlins
D)Abscisic Acid

2)What do you understand by bolting? Which hormone causes it?3) Which hormone will play role in ripening a fruit n delaying leaf senescence?

1. It promotes rooting of cuttings.

2. It retards abscission, so it can be used to prevent premature fruit drop.

3. Some auxins are also powerful weedkillers

4. Auxins inhibit sprouting of potatoes so it also has application in potato storage. 

5. It can be used in delaying leaf senescence in some species.

B. Gibberellins

1. Gibberellins are used for growing seedless grapes.

2. It is used in brewing industry to promote malting.

3. It helps in breaking seed and bud dormancy.

4. It promotes bolting in some rosette plants.

5. It can be used in delaying leaf senescence in some species.

C. Cytokinins

1. Cytokinins are used to prolong the life of fresh leaf crops.

2. It can also be used for keeping flowers fresh.

3. It can be used to break dormancy of some seeds.

4. It promotes stomatal opening.

5. It promotes cell division in apical meristem and cambium.

D. Abscicic acid

1. It promotes bud dormancy in some species.

2. It promotes abscission, so it can be used to regulate fruit drop at the end of season.

3. It can be used to promote closing of stomata under water stress.

4. It can sometimes promote flowering in short day plants.

5. It promotes seed dormancy. 

2. Bolting is the development of flower stalks on a plant. It helps in the early development of the seeds in plants and help them to reproduce further. But it is disadvantageous in the case of crops cultivated for their leaves as it changes the flavor of the leaves of the plant. Bolting is caused by Gibberellins.

3. Ethylene plays a role in ripening fruit and in delaying leaf senescence.