Explanation

The term is Continental Drift.

It was proposed by Alfred Wegener.

It explains that continents were once joined together and later moved apart.

This movement occurs over millions of years.

Continental drift helped lead to the modern theory of plate tectonics.

Explanation

The lowest layer of Earth's atmosphere is called the troposphere.

This layer contains about 75-80% of the atmosphere's total mass and up to 99% of its water vapor. 

Explanation

The study of the universe's origin, nature, and evolution is called Cosmology

Edwin Powell Hubble is called the father of Cosmology.

The term cosmology was first used in English in 1656 in Thomas Blount's Glossographia, with the meaning of "a speaking of the world"

Explanation

Etymology is the study of the origin of words.

At its most basic level, etymology is the study of a word's history

Explanation

• Scientist: Gregor Johann Mendel (1822–1884)
• Experiments: Pea plants (Pisum sativum)
• Law Stated: Alleles of different genes assort independently of each other
• Published Year: 1866
• Mendel is known as the: “Father of Genetics”

Other Mendel Laws:

• Law of Segregation
• Law of Dominance

Last verified on 18-01-2026

Explanation

• Vitamin D helps in absorption of calcium and phosphorus from the intestine.
• Its deficiency leads to softening of bones, called osteomalacia in adults (rickets in children).

Additional information:

• Vitamin D is also known as the “Sunshine Vitamin”.
• Because it is synthesized in the skin by sunlight.

Last verified on 18-01-2026

Explanation

• Egg yolk is a nutritious food rich in fats, proteins, and fat-soluble vitamins.
• It is especially known as a good dietary source of Vitamin D (Calciferol).

Additional information:

• Egg yolk also contains Vitamin A, E, and healthy fats.
• Vitamin D deficiency can cause rickets and weak bones.

Last verified on 18-01-2026

Explanation

Paediatrics is the branch of medicine that deals with the health and medical care of children.

It covers newborns, infants, children, and adolescents.

Explanation

A pacemaker is a small device implanted in the chest.

Its main function is to regulate the heartbeat.

Explanation

Maslow's Hierarchy of Needs theory relates primarily to human motivation

It suggests that human needs are arranged in a pyramid from basic to higher-order needs.

The levels include physiological, safety, social, esteem, and self-actualization.