Explanation

• Ozone (O₃) is mainly found in the Stratosphere, called the ozone layer.
• It absorbs harmful ultraviolet (UV) radiation from the sun, protecting life on Earth.
• Located roughly 15–35 km above the Earth’s surface.

Last verified on 17-01-2026

Explanation

• Ophthalmology is the study and medical specialty concerned with the eyes and vision.
• It deals with the structure, function, diseases, and treatment of the eyes.
• A doctor specializing in this field is called an ophthalmologist.
• Common eye conditions include cataracts, glaucoma, and refractive errors.

Last verified on 08-08-2026

Explanation

Isaac Newton formulated the law of universal gravitation, explaining how gravity works.

He famously described gravity after observing an apple fall from a tree.

Explanation

Antoine Henri Becquerel was an engineer, physicist, Nobel laureate,

First person to discover evidence of radioactivity.

 He belonged to France.

Explanation

• Urine is produced in the kidneys by filtering the blood.
• The kidneys remove excess water, salts, and waste products from the blood.
• Urine is formed in tiny filtering units called nephrons.
• After formation, urine passes through the ureters to the urinary bladder.
• The kidneys help maintain the body's fluid and electrolyte balance.

Last verified on 04-08-2026

Explanation

• William Harvey discovered the circulation of blood.
• He was the first physician to completely describe systemic blood circulation.
• Famous book: De Motu Cordis (On the Motion of the Heart and Blood) (1628)
• He is known as the Father of Circulation of Blood.

Additional information:

• Birth: 1578
• Death: 1657

Last verified on 23-06-2026

Explanation

• Tritium (³H) is the radioactive isotope of hydrogen.
• It undergoes beta (β) decay and changes into Helium-3.

Additional information:

• Hydrogen Isotopes: 3 (Protium, Deuterium, Tritium)
• Protium (¹H): 1 proton, 0 neutrons (Stable)
• Deuterium (²H): 1 proton, 1 neutron (Stable)
• Tritium (³H): 1 proton, 2 neutrons (Radioactive)
• Half-life of Tritium: Approximately 12.3 years

Last verified on 04-08-2026

Explanation

• Einstein's equation E=mc² shows that mass can be converted into energy and vice versa.
• c: Speed of light = 299,792,458 m/s (≈ 3×10⁸ m/s)
• E: Energy
• m: Mass
• It was proposed by Albert Einstein in 1905 as part of the Special Theory of Relativity.

Last verified on 28-07-2026

Explanation

• Cow and Deer are herbivores because they feed on plants.
• Herbivores eat grass, leaves, fruits, and other plant materials.

Additional information:

• Herbivores: Cow, Deer, Goat, Rabbit, Elephant
• Carnivores: Lion, Tiger, Leopard, Wolf, Cheetah
• Omnivores: Human, Bear, Crow, Pig, Hen

Last verified on 27-07-2026

Explanation

• Paramecium contains two nuclei: a macronucleus and a micronucleus.
• The macronucleus controls daily metabolic and cellular activities.
• The micronucleus is responsible for reproduction and genetic exchange.
• Paramecium is a single-celled protozoan found in freshwater.
• It belongs to the phylum Ciliophora.

Last verified on 27-07-2026