Explanation

Talcum powder is made from soap-stone (talc).

It is a soft mineral composed of magnesium, silicon, and oxygen.

It is widely used in cosmetics, baby powder, and industrial applications for its moisture-absorbing and friction-reducing properties.

Explanation

Mali and Haiti are classified as underdeveloped countries due to their low economic growth, poor infrastructure, and high poverty rates.

They struggle with political instability, weak healthcare systems, and limited industrialization.

Explanation

Alexander the Great reached Babylon and died there in 323 BC at the age of 33.

He was a famous Macedonian ruler who expanded his empire across Greece, Egypt, Persia, and India.

Explanation

Central Europe includes countries like Germany, Poland, and France, which have high population densities.

This region has well-developed infrastructure, industries, and urban centers, leading to a dense population.

Explanation

Ghiyas-ud-Din Tughlaq, he ruled from 1320 to 1325, which is five years.

Ghiyas-ud-Din Balban ruled the Delhi Sultanate from 1266 to 1287, a total of 21 years.

Explanation

The Aryans migrated and settled in the North-Western regions of the Indian subcontinent around 1500 BCE.

This area includes present-day Pakistan and northwestern India, where the early Vedic civilization developed.

Explanation

Animals cannot use atmospheric nitrogen directly; they obtain nitrogen by consuming proteins in food.

These proteins are broken down into amino acids, which are used for growth and repair of body tissues.

Explanation

Liquid-cooled garments were first developed for astronauts to regulate body temperature in space.

Now, they are also used by nuclear reactor workers and car racers to prevent overheating in extreme environments.

Explanation

Paper chromatography.

• Most common and simplest technique
• Needs minimal equipment
• Easy to perform
• Uses paper as the stationary phase and solvent as the mobile phase
• Separates components by their affinity for the two phases

Explanation

Plasmodium is a protozoan parasite that causes malaria in humans.

It belongs to the phylum Apicomplexa, which includes other parasitic protozoa.