Explanation

• Apiculture is the practice of rearing honeybees for honey and wax production.
• Helps in pollination and increasing crop yields.
• Honey, beeswax, and propolis are valuable products from apiculture.

• Sericulture → Rearing of silk worms.
• Silviculture → Cultivation of trees and forests.

Last verified on 30-01-2026

Explanation

• Germ Theory of Disease states that microorganisms (germs) cause diseases.
• Proposed by Louis Pasteur (1822–1895), a French scientist.
• This theory revolutionized medicine, leading to vaccines and sterilization methods.

Additional information:

• Robert Koch later developed techniques to identify specific germs for specific diseases.

Last verified on 29-01-2026

Explanation

• When AlCl₃ is heated, it dimerizes to Al₂Cl₆.
• In Al₂Cl₆, each Al atom shares electrons with a Cl atom from the other AlCl₃ unit, forming covalent coordinate (dative) bonds.

Additional information:

• Al₂Cl₆ exists as a dimer in the gas phase, which is electron-deficient and demonstrates Lewis acid behavior.

Last verified on 28-01-2026

Explanation

Explanation

There are four fundamental states of matter: solid, liquid, gas and plasma

1. Solid: Fixed shape and volume; particles tightly packed.
2. Liquid: Fixed volume but takes container's shape; particles close but move.
3. Gas: No fixed shape or volume; particles far apart and move freely. 
4. Plasma: Ionized gas, found in stars, lightning; electrically charged.

Explanation

A species that no longer lives anywhere on the earth is called extinct.

This term refers to a species that has no living individuals remaining on the planet, often determined when the last surviving member dies. 

Examples: Well-known examples include the dinosaur, the woolly mammoth, and the passenger pigeon.

Explanation

The ripening of fruits is a biochemical process.

Oxygen is essential for cellular respiration, which drives ripening.

It helps in conversion of starches to sugars and softening of fruit tissue.

Controlled oxygen levels are used in storage and packaging to manage ripening.

Explanation

Anthracite is the highest grade of coal with the highest carbon content.

It has low moisture and impurities, making it very efficient as fuel.

It burns cleanly and produces more heat compared to other types of coal.

Other forms like lignite and bituminous have higher moisture and lower carbon.

Explanation

In chloroplasts, the Calvin cycle occurs in the stroma.

CO₂ is fixed and converted into sugars in this area.

Thylakoids are the site of light-dependent reactions, not sugar formation.

Stroma contains enzymes needed for carbon fixation.

Explanation

Scientists estimate that 33% of the Earth’s area should be conserved.

This helps maintain biodiversity and ecological balance.

Protected areas include forests, wetlands, and marine zones.