Explanation

• Fine rice (Basmati) requires a low seed rate to ensure proper tillering.
• Recommended seed rate for fine rice is 15 kg per hectare.
• Lower seed rate improves plant spacing and grain quality.
• Used mainly for nursery raising before transplanting.
• Excess seed rate reduces yield and grain quality.

Last verified on 22-01-2026

Explanation

• The endosperm is the main storage tissue in maize seeds.
• It containing nutrients like starch, proteins, and oils.
• It support the growth of the embryo during germination.

Last verified on 22-01-2026

Explanation

• Brainstorming is a widely used technique to generate creative ideas and solutions by encouraging free thinking without immediate judgment.
• It helps individuals or groups explore multiple possibilities quickly, fostering innovation and originality.

Last verified on 22-01-2026

Explanation

• Herbicides kill weeds by disrupting vital plant processes.
• Protein synthesis inhibition stops the formation of essential amino acids.
• Glyphosate inhibits the EPSP synthase enzyme.
• This blocks synthesis of aromatic amino acids, stopping plant growth.
• Widely used as a systemic, non-selective herbicide.

Last verified on 22-01-2026

Explanation

• The vertical movement of water in soil is called capillary rise or soil water movement.
• The first scientific study on this was conducted by Henry Darcy in the mid-19th century.
• Darcy’s work led to the Darcy’s Law, a fundamental principle in hydrology and soil physics.

Additional information:

• Darcy’s Law: Q = K × A × (Δh / L) (Flow rate formula through soil).

Last verified on 22-01-2026

Explanation

• Plants need gas exchange for photosynthesis and respiration.
• Exchange of CO₂, O₂, and water vapor occurs through stomata on leaves.
• Stomata are tiny pores controlled by guard cells.

Additional information:

• Helps maintain internal water balance and gas diffusion.
• Essential for growth, energy production, and transpiration.

Last verified on 22-01-2026

Explanation

• The first process in a petroleum refinery is Distillation.
• It is also known as Fractional Distillation.
• This process separates crude oil into various fractions or types of hydrocarbons, based on their boiling points and molecular weights.

Additional information:

The processes in a petroleum refinery:

1. Cracking
2. Reforming
3. Isomerization
4. Hydrotreating
5. Hydrocracking
6. Catalytic Cracking
7. Alkylation

Last verified on 22-01-2026

Explanation

• Organic matter in soil comes from decayed plants and animals.
• It improves fertility, water retention, and soil structure.
• In Pakistani soils, organic matter is generally less than 1% due to arid climate and low vegetation.

Last verified on 22-01-2026

Explanation

• The ability of soil to resist rupture or deformation under stress is called consistency.
• Indicates how hard, soft, or plastic the soil is.

Additional information:

• Important for engineering, construction, and agriculture.
• Helps determine suitability for foundations, roads, and irrigation.
• Measured using tests like Atterberg limits for clay soils.

Last verified on 22-01-2026

Explanation

• Seeds absorb or release moisture during storage depending on air humidity.
• After a certain period, seed moisture becomes stable.
• This stable moisture level is called equilibrium moisture.
• It depends on temperature and relative humidity of the storage place.
• Important for seed quality and viability.

Last verified on 22-01-2026