Guinness World Records (General Knowledge Focus) MCQs with Answers & Explanations (Page 484)

Explanation Minerals are essential nutrients that play a crucial role in many bodily functions, including: Building strong bones and teeth Regulating body functions Maintaining healthy immune systems Supporting nerve and muscle function

Explanation Carbohydrates are the body's primary source of instant energy. They are broken down into glucose . Which is absorbed into the bloodstream and transported to cells throughout the body. Where it is converted into energy.

Explanation Potato, wheat, rice, corn , and sweet fruits are all rich in carbohydrates . Carbohydrates are an important source of energy for the body.

Explanation Heredity is the property that passes similar characteristics from parents to their offspring , making a human baby similar to human beings.

Explanation In mammals, approximately 70% of their body weight is made up of water. This water is distributed throughout the body and is found in various tissues and organs, including: Blood (83% water) Muscles (75% water) Brain (75% water) Bones (25% water) Skin (60% water)

Explanation Both animal and plant bodies contain a significant percentage of water. 70% is a commonly cited estimate for many living organisms.

Explanation Plants prepare their food (glucose) through photosynthesis. Which requires sunlight , water , carbon dioxide, and chlorophyll. Sunlight provides the energy needed to power the photosynthetic process.

Explanation The life cycle of a bean plant : Seed : The plant begins as a seed, containing the embryo and stored food. Germination : The seed absorbs water, sprouts, and grows its first roots and leaves. Leaf growth : The plant develops its leaves, stems, and roots, and begins to photosynthesize. Flowering : The plant produces flowers, which contain the reproductive organs and allow for pollination.

Explanation The pupal stage of a bee is known as a Cocoon . This stage is characterized by a resting, non-feeding state , where the larva transforms into an adult bee.

Explanation A hydrometer is an instrument used to measure the specific gravity of liquids. It works based on the principle of buoyancy . It is widely used to test milk, alcohol, and battery acid . Commonly used in laboratories and industries . Last verified on 30-01-2026

Explanation Urea fertilizer contains 46% nitrogen (N) . Urea is a white crystalline solid . It is widely used as a fertilizer and animal feed additive. Last verified on 31-01-2026

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 . Additional information : 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 A normal resting respiratory rate for a healthy adult is typically 12 to 20 breaths per minute (bpm) . Abnormal Rates: A rate below 12 or over 25 breaths per minute while resting may indicate an underlying health issue. Variations: Rates can be higher in the elderly (often >28 is considered high) or during physical exertion.

Explanation There are four fundamental states of matter: solid, liquid, gas and plasma Solid: Fixed shape and volume; particles tightly packed. Liquid: Fixed volume but takes container's shape; particles close but move . Gas: No fixed shape or volume; particles far apart and move freely. Plasma: Ionized gas, found in stars, lightning; electrically charged.

Explanation A species that no longer lives anywhere on the e arth 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 bituminou s have higher moisture and lower carbon.

Explanation Sucrose is a common disaccharide found in sugarcane and sugar beet. It is formed by linking one glucose molecule and one fructose molecule. The bond between them is a glycosidic linkage. Disaccharides are broken down int o monosaccharides during digestion.