Identify two of the following phytohormones,which regulate the stomatal movements?
$I.$ $IAA$
$II.$ $GA_3$
$III.$ $Zeatin$
$IV.$ $ABA$

$A$ sleep movement in plants is a nastic response that occurs daily in response to

In which of the following respects do plant hormones differ from enzymes?

During experimentation, why is it difficult to attribute any observed effect to a single hormone?

Read the following statements on plant growth and development.
$A.$ Parthenocarpy can be induced by auxins.
$B.$ Plant growth regulators can be involved in promotion as well as inhibition of growth.
$C.$ Dedifferentiation is a pre-requisite for redifferentiation.
$D.$ Abscisic acid is a plant growth promoter.
$E.$ Apical dominance promotes the growth of lateral buds.
Choose the option with all correct statements.

Which of the following are added as growth promoters in culture media?
$(i)$ Ethylene
$(ii)$ Abscisic acid
$(iii)$ Gibberellin
$(iv)$ Auxin
$(v)$ Cytokinin