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(D) It is difficult to attribute an observed effect to a single hormone because of the following reasons:$1$. Phytohormones are synthesized by plant c

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All of the above.

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(D) It is difficult to attribute an observed effect to a single hormone because of the following reasons:$1$. Phytohormones are synthesized by plant cells individually, but they often exhibit overlapping functions. For example, both $Auxins$ and $Gibberellins$ $(GA)$ can promote stem elongation.$2$. There is no separate, dedicated system for the translocation of each hormone; they often move through the same pathways, leading to intermixed effects.$3$. Phytohormones often act synergistically or antagonistically. For instance, $Ethylene$ and $Abscisic$ $Acid$ $(ABA)$ support each other in various physiological roles.$4$. The effects of phytohormones observed $in$ $vitro$ (in a laboratory setting) often differ significantly from those observed $in$ $vivo$ (within the living organism) due to the complex interaction of multiple signaling pathways.

List-$I$ (Growth Regulator)	List-$II$ (Function/Effect)
$A$. $2,4-D$	$I$. Brewing industry
$B$. $GA_3$	$II$. Stimulation of stomatal closure
$C$. Kinetin	$III$. Herbicide
$D$. $ABA$	$IV$. Nutrient mobilisation

Column-$I$	Column-$II$
$A$. Ethephon	$P$. Inhibits seed germination
$B$. $ABA$	$Q$. They all are acidic
$C$. $GA$	$R$. Help overcome the apical dominance
	$S$. Hastens fruit ripening in tomatoes and apples

Column $I$ (Hormone)	Column $II$ (Effect/Function)
$(a)$ Auxins	$(i)$ Produces male flowers on female plant
$(b)$ Gibberellins	$(ii)$ Parthenocarpy in orange,lemon and grapes
$(c)$ Cytokinin	$(iii)$ Antitranspirant and stress tolerance in plants
$(d)$ Abscisic acid	$(iv)$ Reverses apical dominance in plants

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

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

Water stress makes plant leaves ...$A$... thus,...$B$... the surface area of leaves and their metabolic activity as well. Here $A$ and $B$ refer to:

Match List-$I$ with List-$II$:
List-$I$ (Growth Regulator) List-$II$ (Function/Effect)
$A$. $2,4-D$ $I$. Brewing industry
$B$. $GA_3$ $II$. Stimulation of stomatal closure
$C$. Kinetin $III$. Herbicide
$D$. $ABA$ $IV$. Nutrient mobilisation

Choose the correct answer from the options given below:

Match the following.
Column-$I$ Column-$II$
$A$. Ethephon $P$. Inhibits seed germination
$B$. $ABA$ $Q$. They all are acidic
$C$. $GA$ $R$. Help overcome the apical dominance
$S$. Hastens fruit ripening in tomatoes and apples

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