Explanation

• Oxidation of secondary alcohols produces ketones.
• Secondary alcohols have –OH group attached to a carbon bonded with two other carbons.
• During oxidation, hydrogen is removed and a carbonyl (C=O) group is formed.

Additional information:

• Primary alcohol → Aldehyde → Acid
• Secondary alcohol → Ketone (stops here)
• Tertiary alcohol → No easy oxidation

Last verified on 05-06-2026

Explanation

• Natural rubber consists of polymers of isoprene (C₅H₈).
• Isoprene is a five-carbon unsaturated hydrocarbon.
• Natural rubber is chemically known as cis-1,4-polyisoprene.
• It is obtained from the latex of rubber plants.

Last verified on 05-06-2026

Explanation

• Chromatography mainly works on the principle of adsorption.
• Different substances are adsorbed to different extents on a stationary phase.
• This causes separation of components in a mixture.

Last verified on 05-06-2026

Explanation

• Trichinosis is a disease caused by a parasitic worm.
• It is caused by Trichinella spiralis.
• It spreads through undercooked or infected meat.
• It affects muscles and digestive system in humans.

Last verified on 04-06-2026

Explanation

• Ascorbic Acid is commonly known as Vitamin C.
• It is essential for growth, repair, and maintenance of body tissues.
• Prevents scurvy, a disease caused by Vitamin C deficiency.

Additional information:

Sources of Vitamin C (5):

1. Orange
2. Lemon
3. Guava
4. Strawberry
5. Bell pepper

Functions:

• Antioxidant
• Collagen synthesis
• Strengthens immunity

Last verified on 19-01-2026

Explanation

• Thymus gland becomes inactive during old age.
• It is active during childhood for immune system development.
• It helps in maturation of T-lymphocytes (T cells).
• After puberty, it gradually shrinks and loses function.

Last verified on 04-06-2026

Explanation

• RNA polymerase is the enzyme required for transcription.
• It helps in synthesizing RNA from a DNA template.
• Transcription is the first step of gene expression.
• It occurs in the nucleus of eukaryotic cells.
• RNA strand is formed complementary to DNA.

Last verified on 04-06-2026

Explanation

• Bombyx mori, which is the scientific name for the Mulberry silkworm.
• This species is widely cultivated for its silk production.
• It is often referred to as the "Domesticated silkworm" or simply "Silkworm".

Last verified on 04-06-2026

Explanation

• Nicolaus Copernicus is called the Father of Modern Astronomy.
• He introduced the heliocentric theory in 1543.
• This theory stated that the Sun is at the center of the solar system.
• His ideas changed the old belief that Earth is the center.

Additional information:

• Galileo Galilei, a later figure, is often called the "father of observational astronomy".

Last verified on 01-06-2026

Explanation

• The Earth’s circumference at the equator is about 40,075 km (24,901 miles).
• Measured through the poles, it is slightly smaller: 40,008 km (24,860 miles).
• The difference is due to the equatorial bulge caused by Earth's rotation.
• Diameter: ~12,756 km (7,926 miles).
• Age of Earth: ~4.453 billion years.

Last verified on 31-03-2026