Concept:Farm power can be obtained from different sources, and some of these sources release harmful materials into the air, land, or water around the farm.
Explanation:Chemical sources of farm power store energy in substances such as petroleum products.
When these substances are burned, they give off toxic fumes and can leach into water, causing water pollution.
Mechanical power is produced by internal combustion engines and machines.
These engines burn fuel, so they release smoke and exhaust gases into the air and also create loud noise.
Therefore, mechanical power causes air pollution and noise pollution.
Hydro power is obtained from falling or flowing water using dams and turbines.
The construction of hydro dams can flood large areas of land, disturb the soil, and produce decaying matter that releases unpleasant gases into the air.
So hydro power can also bring about land and air pollution on the farm.
Electrical power works through electric motors and appliances that generate no smoke, fumes, or noise at the point of use on the farm.
Hence, electrical power is the cleanest source among the options and does not cause pollution.
Answer:Option B. Electrical