Explanation

• Carbamate and organophosphate insecticides mainly affect the nervous system by inhibiting the enzyme acetylcholinesterase.
• This causes acetylcholine to accumulate at nerve junctions, leading to continuous nerve stimulation, paralysis, and potentially death.
• These insecticides can also be toxic to humans and other animals, so proper handling and protective equipment are essential.

Last verified on 16-10-2026

Explanation

• Approximately 80,000 setts per hectare is a possible recommended figure.
• Sugarcane setts are pieces of sugarcane stalk containing buds used for planting and propagation.
• The number of setts required per hectare depends on row spacing, sett length, number of buds, and planting method.

Last verified on 16-10-2026

Explanation

• Predator-prey: One organism (the predator) hunts, kills, and directly eats another living organism (the prey) for food.
• Example: A lion hunting and eating a zebra.

Additional information:

• Parasitism: One organism (the parasite) lives on or inside another organism (the host) and feeds off it. It harms the host but usually does not kill it right away.
• Example: Fleas drinking blood from a dog.
• Mutualism: A close relationship where both organisms help each other and benefit.
• Example: Bees collecting nectar while pollinating flowers.

Last verified on 16-10-2026

Explanation

• Tropical regions generally have high temperatures, abundant rainfall, and high humidity, especially near the equator.

Additional information:

• Arid regions are dry and receive very little rainfall.
• Polar regions have extremely low temperatures and generally low precipitation.

Last verified on 16-10-2026

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

Explanation

• The idiom "A bird in the hand is worth two in the brush." 
• It means it's better to hold onto what you have than to risk it for something greater but uncertain.

Last verified on 15-10-2026

Explanation

• Often is an adverb of frequency because it tells how frequently an action occurs.
• Example: He often visits his grandparents.
• Other adverbs of frequency include always, usually, sometimes, rarely, and never.

Last verified on 15-10-2026

Explanation

• In Microsoft Word, the Table of Figures feature is available under the References tab.

Additional information:

• Insert Caption: Adds a caption to a figure, chart, or table.
• Insert Table of Figures: Creates a list of figures based on their captions.
• Update Table: Updates the list when captions or page numbers change.
• Table of Contents: Creates a list of document headings.
• Location: References tab → Captions group → Insert Table of Figures.

Last verified on 15-10-2026