Which type of phytohormone is made up of indole compounds?

Grass coleoptile tips bend towards the source of light because:

Phototropism and geotropism are associated with which of the following?

$A$ green plant bends towards the source of light when exposed to light on only one side. Which of the following is the best explanation for this phenomenon?

What will happen if the shoot apex is removed from a plant?

Plants which are deficient in zinc will show reduction in the biosynthesis of