Through their effect on plant growth regulators, what do the temperature and light control in the plants?

1. Flowering 

2. Closure of stomata

3. Fruit elongation 

4. Apical dominance 

Vernalisation stimulates flowering in:
1. Turmeric
2. Carrot
3. Ginger
4. Zaminkand

Treatment of seed at low temperature under moist conditions to break its dormancy is called:

1. sacrification

2. vernalization

3. chelation

4. stratification