Differentiate between the following plant growth regulators:
$(1)$ Auxins $(IAA)$ and Abscisic acid $(ABA)$
$(2)$ Gibberellins and Ethylene

(N/A) $(1)$ Auxins $(IAA)$ vs. Abscisic acid $(ABA)$:
- Auxins are growth-promoting hormones that stimulate cell elongation,root initiation,and apical dominance.
- Abscisic acid $(ABA)$ is a growth-inhibiting hormone that promotes seed dormancy,stomatal closure during water stress,and abscission of leaves and fruits.
$(2)$ Gibberellins vs. Ethylene:
- Gibberellins are growth-promoting hormones that stimulate stem elongation,seed germination,and flowering.
- Ethylene is a gaseous hormone that primarily promotes fruit ripening,senescence of leaves and flowers,and horizontal growth of seedlings.