Which of the following auxins is widely used as a weedicide?

$A$ plant placed near a window bends outwards because

In botanical gardens and tea gardens,gardeners trim the plants regularly so that they remain bushy. Does this practice have any scientific explanation?

What causes a green plant exposed to the light,on only one side,to bend towards the source of light as it grows?

With which of the following processes is the Cholodny-Went theory concerned?

Geotropic response of roots is due to