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Cheat sheet
CBSE · Class 12 · Social Science

Primary Activities

Getting resources directly from nature: gathering, nomadic herding and ranching, the main types of farming and where they are found, co-operatives, and mining.

Key ideas

Remember

Truck farm distancespeed × hours a truck drives overnight
Ranch capacityhectares grazed at a time × animals per hectare
Output per workertotal output ÷ workers
Milk in a monthcows × litres each a day × 30
Grain regionssteppes, Prairies, Pampas, Velds, Australian Downs, Canterbury Plains
Names for shifting cultivationmilpa in Mexico and Central America; jhuming in north-eastern India

Watch out

Worked example

Suppose Farm A (paddy) has 3 ha, 3 workers and yields 7 tonnes per ha; Farm B (wheat) has 2,000 ha, 5 workers and yields 2 tonnes per ha. Which has the higher yield per hectare, and which produces more per worker?

Working: output = area × yield; ÷ workers

Answer: Farm A per hectare (7 vs 2 t); Farm B per worker (800 vs 7 t)