Edward Jenner is credited with developing the first vaccine against: MCQ with Answer and Explanation

Edward Jenner is credited with developing the first vaccine against:
A. Polio
B. Rabies
C. Smallpox
D. Tuberculosis
Answer: Option C
Solution (By JKSSB Mock Tests)
Edward Jenner, an English physician, is known as the 'father of immunology'. In 1796, he developed the world's first successful vaccine against smallpox. He observed that milkmaids who had contracted cowpox (a mild disease) were immune to smallpox. He inoculated a boy with material from a cowpox blister, successfully conferring immunity to smallpox, thus pioneering the concept of vaccination.

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Practice More Biology Questions

Question #1
Which of the following is a macronutrient for plants?
A. Phosphorus
B. Iron
C. Zinc
D. Copper

Correct Answer: Option A


Explanation:
Phosphorus is a primary macronutrient (along with nitrogen and potassium) required in relatively large amounts for nucleic acids, ATP, and phospholipids. Iron, zinc, and copper are micronutrients needed in trace amounts. Macronutrients include C, H, O, N, P, K, Ca, Mg, S. Micronutrients function as enzyme cofactors.

This question belongs to: Science Biology
Question #2
Which hormone regulates the blood calcium level by lowering it?
A. Calcitonin
B. Thyroxine
C. Parathyroid hormone
D. Insulin

Correct Answer: Option A


Explanation:
Calcitonin, secreted by parafollicular (C) cells of the thyroid, decreases blood calcium by inhibiting osteoclasts and promoting calcium deposition in bones. Parathyroid hormone (PTH) raises calcium.

This question belongs to: Science Biology
Question #3
The element that is a key component of the thyroid hormones T₃ and T₄ is:
A. Calcium
B. Iron
C. Phosphorus
D. Iodine

Correct Answer: Option D


Explanation:
Iodine atoms are incorporated into thyroxine (T₄, 4 iodine atoms) and triiodothyronine (T₃, 3 iodine atoms) synthesized by thyroid follicular cells. Iodine deficiency leads to goiter and hypothyroidism. Iron is in hemoglobin, calcium in bones, phosphorus in ATP and bones.

This question belongs to: Science Biology