The number of Agro-Ecological Zones in India is:

Correct option is B

The National Bureau of Soil Survey and Land Use Planning (NBSS & LUP), ICAR, classified India into 20 Agro-Ecological Zones (AEZs).

These zones are defined based on key factors like:

Soil type and characteristics

Climate (temperature, rainfall, humidity)

Physiography (landform features)

Length of growing period (LGP)

Water availability and irrigation potential

The purpose of such classification is to facilitate effective agricultural planning, resource utilization, and recommending suitable cropping patterns for each zone.

Hence, the correct number is 20 AEZs.