Identify the incorrectly matched pair:

	PGR	Chemical nature
1.	Auxins	Indole compounds
2.	Cytokinin	Pyrimidine derivatives
3.	ABA	Carotenoid derivative
4.	Gibberellic acid	Terpenes

Identify the plant growth regulator that, though is largely an inhibitor but, can be placed in both plant growth promoter and plant growth inhibitor groups?

Identify the incorrectly matched pair:

Callus from internodal segments of tobacco stem gets proliferated only if in addition to one of the following – extracts of vascular tissues, yeast extract, coconut milk or DNA, the nutrient medium also contains:

Auxin was first isolated from:

Auxin does not:

To extend their market period, fruits can be left on trees longer by the application of:

Kinetin was first discovered from:

Cytokinins do not help in:

Cytokinins help in delay of leaf senescence because they: