All Free Everyday Science MCQs with Answers

1421. Which of the following is a function of Vitamin A in the body?

• A. Vision, bone and body growth
• B. Immune defenses, maintenance of body linings and skin
• C. Normal cell development and reproduction
• D. All of the above

Explanation: Vitamin A supports vision, growth, immune defence, healthy skin and body linings, cell development and reproduction. Since all three statements describe its functions, the combined option is correct.

1422. Vitamin C deficiency leads to:____________?

• A. Scurvy
• B. Cold
• C. Cancer
• D. Rickets

Explanation: Vitamin C is needed for collagen formation and healthy connective tissue; severe deficiency causes scurvy, with bleeding gums and poor wound healing. Rickets is linked mainly to vitamin D deficiency.

1423. The volume of Blood in a Human body to be approximately _________ of body weight?

• A. 6%
• B. 7%
• C. 8%
• D. 9%Biological Sciences

Explanation: An average adult has about 7% of body weight as blood, although the proportion varies with age, sex and body composition. This corresponds to roughly 5 litres in a typical adult.

1424. Lack of _______ causes diabetes?

• A. Vitamins
• B. Sugar
• C. Insulin
• D. Calcium

Explanation: Insulin, produced by the pancreas, helps body cells absorb glucose from the blood. A lack of insulin, or resistance to its action, causes diabetes and leads to high blood sugar.

1425. Dengue Fever is also called___________?

• A. Black Fever
• B. Breakbone Fever
• C. Plasmodium Fever
• D. Remittent Fever

Explanation: Dengue is popularly called breakbone fever because severe muscle and joint pain can make the body feel as though its bones are breaking. It is caused by a dengue virus transmitted mainly by Aedes mosquitoes.

1426. Pathology is the study of____________?

• A. Ethics
• B. Disease
• C. Future
• D. Cancer

Explanation: Pathology examines diseases, including their causes, development, and effects on tissues and organs. Cancer is one subject within pathology, not its complete definition.

1427. Hepatitis is a disease of which of the following organ?

• A. Heart
• B. Liver
• C. Lungs
• D. Brain

Explanation: Hepatitis means inflammation of the liver, most commonly caused by hepatitis viruses, although alcohol and other factors can also cause it. The heart, lungs, and brain are not the organ named by the term.

1428. Which of the following female mosquito is the cause of Dengue fever?

• A. Aedes Aegypteis
• B. Anophilies
• C. Barinohils
• D. N.O.A

Explanation: Dengue is mainly transmitted by the female Aedes aegypti mosquito, which needs blood for egg development. The option's spelling is incorrect, but it clearly refers to Aedes aegypti.

1429. Segmented Worms take breath through:_________?

• A. Mouth
• B. Nose
• C. Moist Skin
• D. Head

Explanation: Segmented worms such as earthworms breathe through their moist skin, where oxygen diffuses into the blood and carbon dioxide diffuses out. Their skin must stay moist for this exchange to occur.

1430. Which are the largest of the white blood cells?

• A. lymphocytes
• B. eosinophils
• C. basophils
• D. monocytes

Explanation: Monocytes are the largest normal white blood cells in the blood and can develop into macrophages after entering tissues. Lymphocytes, eosinophils, and basophils are generally smaller.