Free Human Body and Health MCQs with Answers

241. A colour blind person cannot distinguish between _________?

• A. White & Yellow
• B. Red & Green
• C. Red & Black
• D. Green & Black

Explanation: The common form of red-green colour blindness makes red and green hues difficult to distinguish because the relevant cone pigments are absent or abnormal. Other colour-vision defects exist, but red-green deficiency is the standard answer.

242. Study of joints called:

• A. Esthesiology
• B. Splanchnology
• C. Arthrology
• D. Anthropology

Explanation: Arthrology is the branch of anatomy concerned with joints and their articulations. Splanchnology studies the internal organs, while anthropology studies humans and cultures.

243. Retinol is the chemical name of?

• A. Vitamin A
• B. Vitamin B
• C. Vitamin C
• D. Vitamin K

Explanation: Retinol is the alcohol form of vitamin A and is important for vision, epithelial tissues, and growth. Vitamins B, C, and K have different chemical forms and functions.

244. Virus was discovered by?

• A. Dmitry Ivanovsky
• B. Robert hook
• C. Antony
• D. Brown

Explanation: Dmitry Ivanovsky provided the first evidence of viruses in 1892 while studying tobacco mosaic disease, whose infectious agent passed through bacteria-blocking filters. The other names listed are associated with microscopy or other discoveries.

245. Which blood cells are called 'Soldiers' of the body ?

• A. WBC
• B. Platelets
• C. RBC
• D. All of the above

Explanation: White blood cells are called the body's soldiers because they identify and attack pathogens, providing immune defense. Red blood cells carry oxygen, while platelets help blood clot.

246. In thrombocytopenia condition, bone marrow makes?

• A. Too few platelets
• B. Normal platelets
• C. Too many platelets
• D. Does not effect

Explanation: Thrombocytopenia means an abnormally low platelet count, usually because platelet production is reduced, destruction is increased, or both occur. Platelets are needed for normal blood clotting.

247. In Essential thrombocythemia (ET) condition, bone marrow makes?

• A. Too few platelets
• B. Normal platelets
• C. Too many platelets
• D. Does not effect

Explanation: Essential thrombocythemia is a bone-marrow disorder in which abnormal megakaryocyte activity produces excessive platelets. This is the reverse of thrombocytopenia, which involves too few platelets.

248. A normal platelets count range ?

• A. 1.5 lac - 4.5 lac platelets per liter blood.
• B. 1.5 lac - 4.5 lac platelets per micro-liter of blood.
• C. 1.5 million - 4.5 million platelets per liter of blood.
• D. 1.5 million - 4.5 million platelets per micro-liter of blood.

Explanation: A normal platelet count is approximately 150,000 to 450,000 per microliter of blood, written here as 1.5 to 4.5 lakh per microliter. The options using per liter or millions per microliter have incorrect units or magnitudes.

249. Which Harmone contain iodine?

• A. Thyroxine
• B. Insulin
• C. Adrenaline.
• D. None of these

Explanation: Thyroxine, the hormone produced by the thyroid gland, contains iodine and helps regulate metabolic rate. Insulin and adrenaline do not contain iodine.

250. Gland responsible for heightened emotions is?

• A. Pituitary gland
• B. Thoiroid gland
• C. Adrenal gland
• D. None of these

Explanation: The adrenal glands release adrenaline and related hormones during fear, stress, or excitement, producing heightened emotional and physical responses. The pituitary mainly coordinates other endocrine glands, while the thyroid controls metabolism.