What causes the movement of leaves in the $Mimosa$ $pudica$ plant?

Opening of flower is an example of

It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

The following statements are given about plant growth hormones:
$I.$ Cytokinins suppress the synthesis of chlorophyll.
$II.$ Auxins control apical dominance.
$III.$ Gibberellins promote shoot elongation.
$IV.$ Abscisic acid enables seeds to withstand desiccation.
Which of the above statements are correct?

Distinguish between the functions of Ethylene and Abscisic Acid $(ABA)$ from the given statements:
$I -$ Induces closure of stomata.
$II -$ Initiates flowering in pineapple.
$III -$ Initiates germination in peanut seeds.
$IV -$ Synthesized in large amounts by ripening fruits.
$V -$ Plays an important role in seed development,maturation,and dormancy.
Identify the correct sequence for Ethylene and Abscisic Acid respectively.

Describe the following plant growth regulators:
$(1)$ Gibberellins
$(2)$ Cytokinins