Abiotic stressors such as temperature extremes or lack of water trigger , which aids in preventing water loss from the plant.
a. circadian rhythms
b. vernalization
c. systemic acquired resistance
d. hypersensitivity
e. ABA synthesis

Option B) Vernalization

Abiotic stressors such as temperature extremes or lack of water trigger ABA synthesis, which aids in preventing water loss from the plant.

Explanation:

Either during temperature extremes like very low temperatures or drought conditions, the production of absiccisic acid (ABA), a plant hormone is elevated.

This is due to the need for regulate water levels, and stomatal closure to reduce water loss for plant survival.

Thus, ABA synthesis is the answer

not sure if this is what you'r looking for eubacteria and archaebacteria