Explanation

• In 1980, the Pakistan Agricultural Research Council (PARC) divided Pakistan into 10 agro-ecological zones.
• The classification was based on physiography, climate, soil, land use, and water availability.
• These zones help identify suitable crops and agricultural practices for different regions of Pakistan.

Last verified on 16-10-2026

Explanation

• Anti-dunes are bedforms that develop under supercritical flow conditions, where the Froude number is greater than 1.
• The Froude number is the ratio of flow inertia to the effect of gravity.

Additional information:

• Fr<1: Subcritical flow.
• Fr=1: Critical flow.
• Fr>1: Supercritical flow.

Last verified on 16-10-2026

Explanation

• Camshaft: Controls the opening and closing of the intake and exhaust valves at the correct time.

Additional information:

• Crankshaft: Converts the pistons’ reciprocating motion into rotational motion.
• Flywheel: Stores rotational energy and helps maintain smooth engine operation.

Last verified on 16-10-2026