The positive geotropic response of a root is:

Which auxin should be used to eradicate dicotyledonous weeds from a monocotyledonous crop field?

During germination,the stem grows upward and the root grows downward because:

Match the following columns.

Column-$I$	Column-$II$
$A$. Natural auxin	$1$. $IAA$
$B$. Synthetic auxin	$2$. $NAA$
	$3$. $IBA$
	$4$. $2,4-D$

Choose the correct matching sequence.

Phenyl acetic acid is a:

What is the mechanism underlying the phenomenon by which the terminal/apical bud suppresses the growth of lateral buds? Suggest measures to overcome this phenomenon.