Which plant growth regulator is used to initiate flowering and synchronising fruit-set in pineapples?
1. Gibberellins
2. Cytokinins
3. ABA
4. Ethylene
Seed dormancy can be due to the presence of chemical inhibitors which include all the following except:
1. abscisic acids
2. phenolic acids
3. para-ascorbic acid
4. gibberellic acid
Which PGR stimulates the closure of stomata and increases the tolerance of plants to various kinds of stresses?
1. Abscisic acid
2. Ethylene
3. Auxins
4. Cytokinins