Explanation

• The number of spark plugs needed in a diesel engine is zero
• Diesel engines use compression ignition instead of a spark.
• Air is compressed until it is hot enough to ignite the fuel.
• Instead of spark plugs, they use glow plugs to warm the engine when cold

Explanation

• The Pakistan Agricultural Research Council (PARC) divided Pakistan into 10 agro-ecological zones.
• This classification considers factors such as climate, rainfall, temperature, soils, and agricultural potential.
• The zones help researchers and planners identify suitable crops and develop region-specific agricultural practices.

Last verified on 16-10-2026

Explanation

• An experimental unit is the smallest unit of experimental material to which a treatment is independently applied.
• In agricultural experiments, it may be a plot of land, an individual plant, or a group of animals, depending on the study.

Last verified on 16-10-2026

Explanation

• An auger is a screw-shaped mechanism that moves and meters granular materials such as fertilizer.
• In fertilizer applicators, it helps deliver fertilizer at a controlled rate to the soil.
• The application rate depends on factors such as auger speed, design, and the material being handled.

Last verified on 16-10-2026

Explanation

• A change of 1 Kelvin (K) is equal in magnitude to a change of 1 degree Celsius (°C).
• Therefore, a rise of 10 K equals a rise of 10°C.
• The numerical values of Kelvin and Celsius differ when expressing an actual temperature, but their temperature intervals are equal.

Last verified on 16-10-2026

Explanation

• Strain is the ratio of the change in length to the original length of a material when a force is applied.
• It measures the relative deformation of a material.
• It has no unit, because it is a ratio of two lengths.

Last verified on 16-10-2026

Explanation

• Phosphorus fixation occurs when phosphorus reacts with soil minerals and forms compounds that plants cannot readily absorb.
• In acidic soils, phosphorus commonly reacts with iron and aluminium compounds; in alkaline or calcareous soils, it may precipitate with calcium.

Last verified on 16-10-2026

Explanation

• Cactus is a CAM plant.
• CAM plants minimize photorespiration by concentrating CO₂ around the enzyme Rubisco during photosynthesis.

Last verified on 16-10-2026

Explanation

• Lipids (fats) are generally present in relatively low amounts in most fruits and vegetables.
• Fruits and vegetables mainly provide water, vitamins, minerals, dietary fibre, and carbohydrates.

Last verified on 16-10-2026

Explanation

• Vitamins A, D, E, and K are fat-soluble vitamins, not water-soluble.
• Vitamin B-complex and Vitamin C are water-soluble vitamins.

Additional information:

• Vitamin A: Important for vision and healthy skin.
• Vitamin K: Essential for normal blood clotting.
• Vitamin C: Helps in collagen formation and wound healing.

Last verified on 16-10-2026