All Free Everyday Science MCQs with Answers

1331. In HomoSapiens (Human) the fertilization occurs in the___________?

• A. Uterus
• B. Ovaries
• C. Oviduct
• D. Cervix

Explanation: In humans, fertilization normally occurs in the fallopian tube, also called the oviduct, usually in its ampulla. The fertilized egg then travels to the uterus for implantation.

1332. Which of the following vitamin is known as Niacin?

• A. vitamin B-6
• B. vitamin B-12
• C. vitamin B-1
• D. vitamin B-3

Explanation: Niacin is vitamin B3, a water-soluble vitamin needed for energy metabolism and healthy skin and nerves. Vitamin B1 is thiamine, while B6 and B12 are different vitamins.

1333. The deficiency of vitamin K causes ________ ?

• A. Loss of appetite
• B. Scurvy
• C. Sterility
• D. Blood clotting disorder

Explanation: Vitamin K is required for producing several clotting factors in the liver, so its deficiency causes prolonged bleeding or a blood-clotting disorder. Scurvy results from vitamin C deficiency.

1334. The deficiency of vitamin E causes _______ ?

• A. Weak immune system
• B. Weak bones
• C. Lack of appetite
• D. Sterility

Explanation: Severe vitamin E deficiency can damage reproductive function and is classically associated in basic nutrition questions with sterility. Vitamin D deficiency is the typical cause of weak bones.

1335. Dead red blood corpuscles are stored in____________?

• A. Liver
• B. Spleen
• C. Kidney
• D. Heart

Explanation: The spleen filters blood and removes worn-out red blood cells, while recycling much of their iron. The liver also helps process their breakdown products, but the spleen is the main organ associated with their storage and removal.

1336. Which human hormone is called love hormone?

• A. Oxytocin
• B. Melatonin
• C. Adrenalin
• D. Renin

Explanation: Oxytocin is associated with bonding, trust and childbirth, which is why it is popularly called the love or bonding hormone. Melatonin regulates sleep, while adrenaline supports the fight-or-flight response.

1337. What is the body's natural or acquired ability to resist certain diseases?

• A. Immunity
• B. Endocrine
• C. Exocrine
• D. All of above

Explanation: Immunity is the body's ability to resist particular diseases through innate defenses or acquired immune responses. Endocrine and exocrine describe types of glands, not disease resistance.

1338. The olfactory nerves affect what sense in brain?

• A. Smell
• B. Feel
• C. Touch
• D. Hear

Explanation: The olfactory nerves carry signals from receptors in the nose to the brain for the sense of smell. Touch and hearing use different sensory nerves and pathways.

1339. Penicillin is used to fight what type of infections?

• A. Bacteria
• B. Viral
• C. Pneumonia
• D. Sepsis

Explanation: Penicillin is an antibiotic, so it acts against susceptible bacteria by interfering with their cell-wall formation. It does not treat viral infections, although some pneumonia and sepsis cases can be bacterial.

1340. People with what blood type can give blood to anyone and are thus called universal donors?

• A. O-
• B. O
• C. AB+
• D. AB-

Explanation: O-negative red blood cells lack A, B and Rh-D antigens, reducing the risk of incompatibility when urgently transfused. Universal-donor status applies mainly to red-cell transfusions, not every type of blood product.