When tropical plants are shifted to temperate climate,they do not grow. This is due to

List five main groups of natural plant growth regulators. Write a note on discovery,physiological functions and agricultural/horticultural applications of any one of them.

Match the following (Column-$I$ with Column-$II$):

Column-$I$	Column-$II$
$a.$ Ethephon	$(i)$ $GA$
$b.$ Terpene	$(ii)$ Ethylene
$c.$ Zeatin	$(iii)$ Natural auxin
$d.$ $IAA$	$(iv)$ Cytokinin

Both nyctinasty and thigmonasty are observed in

Where are the following hormones synthesized in plants?
$(a)$ $IAA$
$(b)$ Gibberellins
$(c)$ Cytokinins

Identify the partial parasite and total parasite plants,respectively,from the following.