Ephemerals are xerophytes that are:

Which one of the following pairs of plant hormones inhibits flowering in some plants?

Desert can be converted into greenland by

The movement in the "Touch-me-not" plant $(Mimosa pudica)$ in response to touch is known as:

One hormone hastens the maturity period in juvenile conifers,a second hormone controls xylem differentiation,while the third increases the tolerance of plants to various stresses. They are respectively:

$I.$ Auxin,$II.$ Cytokinin,$III.$ $GA$,$IV.$ $ABA$.
Which of the above-mentioned $PGR$ are acidic in nature? Choose the correct option accordingly.