Find the angle between the lines whose direction ratios

Light intensity at which photosynthesis and respiration are equal is known as:

What agricultural system involves the deliberate use of land for simultaneous agricultural, tree, and forest crop production?

VAM is associated with

Black soil is use for the cultivation of 

The major part of soil type found in Madhya Pradesh is:

A center of diversity is defined as a region with:

Genes do not occur in pairs  .......................?

The most abundant mineral nutrient in plant is

Arhar (pigeonpea) is commonly known as