Most plants obtain their nitrogen from the soil in the forms of:

First Milk produced by cow immediately after giving birth to calf which is nutritious and rich in antibody

A system in which fast growing fodder, shrubs and trees are planted for purpose of mulch green manure soil conservation is

Which tropical tree species is rich in vitamin C with multiple medicinal property and extensively used in Ayurveda           

Plants that do not germinate when exposed to light are called as___