Free Human Body and Health MCQs with Answers

421. The hormone that increases the rate of heart beat and blood pressure after shock in a person is___________?

• A. Adrenalin
• B. Gastrin
• C. Thyroxin
• D. Pancreatic

Explanation: Adrenalin, also called epinephrine, prepares the body for emergency action by increasing heart rate and blood pressure. Gastrin acts mainly on the stomach, while thyroxine regulates metabolic rate more broadly.

422. Being Myopic means you have problem in seeing ______________?

• A. Distant objects clearly
• B. Close objects clearly
• C. Both A and B
• D. Distant and close objects look unclear

Explanation: Myopia, or short-sightedness, occurs when the eye focuses distant images in front of the retina, so nearby objects are clearer while distant objects look blurred.

423. Which process includes all of the other processes listed?

• A. Absorption
• B. Assimilation
• C. Secretion
• D. Metabolism

Explanation: Metabolism is the complete set of chemical reactions in the body and includes the processes that build, break down, absorb, and use substances. Absorption, assimilation, and secretion are narrower physiological processes.

424. Which animal has no vocal chords ?

• A. Lion
• B. Zebra
• C. Dolphin
• D. Giraffes

Explanation: Giraffes are commonly described as having no vocal cords and communicate using low-frequency sounds, including sounds below the range of human hearing. The other listed animals produce ordinary vocal sounds.

425. Stripes on each side of "Grévy's Zebra" is about_________?

• A. 20+
• B. 30+
• C. 80+
• D. 36+Standardized & Admissions Tests

Explanation: Grevy's zebra has a particularly large number of narrow stripes, commonly stated as more than 80 on each side. This distinguishes it from the less finely striped plains zebra.

426. Age of the lion is determined through?

• A. Nose Colour
• B. Length of the tail
• C. Length of Nails
• D. Hair Colour

Explanation: A lion's age can be estimated from changes in its nose colour: the nose develops darker spots as the lion grows older. Tail length, nail length, and hair colour are not reliable standard indicators.

427. A bird that can fly backwards?

• A. Bat
• B. Humming Bird
• C. Crimson Sun Bird
• D. Cardinal Bird

Explanation: The hummingbird is the only bird capable of sustained backward flight because its rotating wing motion and shoulder structure allow it to generate lift while moving backward. The other options cannot perform this controlled flight.

428. Animal with the sharpest hearing ability?

• A. Rat
• B. Greater wax moth
• C. Bat
• D. Squirrel

Explanation: The greater wax moth can detect extremely high-frequency sounds, reportedly up to about 300 kHz, giving it the sharpest known hearing among animals. This helps it detect the ultrasonic calls of bats, its predators.

429. How many hearts an Octopus has?

• A. 10
• B. 8
• C. 5
• D. 3

Explanation: An octopus has three hearts: two pump blood to the gills and one pumps oxygenated blood to the rest of the body. The number eight refers to its arms, not its hearts.

430. Goitre is associated with___________?

• A. Pituitary gland
• B. Thyroid gland
• C. Thymus gland
• D. Para-Thyroid gland

Explanation: Goitre is an enlargement of the thyroid gland, often caused by iodine deficiency or another thyroid disorder. The pituitary regulates many glands, but it is not the gland that enlarges in goitre.