Home / iGCSE Biology (0610)-15.1 Drugs – iGCSE Style Questions Paper 1

iGCSE Biology (0610)-15.1 Drugs – iGCSE Style Questions Paper 1

Question

Which statement about antibiotics is correct?

▶️ Answer/Explanation
Solution

Ans: A

Antibiotics are indeed drugs used to treat bacterial infections. They’re produced by fungi/bacteria (not white blood cells), bacteria become resistant to them (not vice versa), and they don’t work on viruses. Thus, only statement A is correct.

Question

Which statements about drugs are correct?

  1. Drugs affect or modify chemical reactions in the body.
  2. Drugs called antibiotics can be used to kill bacteria.
  3. Drugs called antibiotics can be used to kill viruses.

A) 1 and 2
B) 2 and 3
C) 1 only
D) 2 only

▶️ Answer/Explanation
Solution

Ans: A

Analysis of each statement:

  1. Correct: Drugs alter biochemical processes (e.g., painkillers block pain signals, antibiotics disrupt bacterial metabolism).
  2. Correct: Antibiotics specifically target bacteria (e.g., penicillin inhibits bacterial cell wall synthesis).
  3. Incorrect: Antibiotics are ineffective against viruses; antivirals or vaccines are required for viral infections.

Thus, only statements 1 and 2 are correct, making A the right choice.

Question

In an experiment, bacteria were grown on agar. Four paper discs, A, B, C and D, were placed on top of the agar. Each paper disc contained a different antibiotic. The diagram shows the agar after 48 hours. The clear areas show where bacteria are not growing. Which antibiotic are the bacteria most resistant to?

▶️Answer/Explanation

Ans B 

Question

Which statements about drugs are correct?

1 Drugs affect or modify chemical reactions in the body.
2 Drugs called antibiotics can be used to kill bacteria.
3 Drugs called antibiotics can be used to kill viruses.

A 1 and 2

B 2 and 3

C 1 only

D 2 only

▶️Answer/Explanation

Ans A

Question

A disease cannot be treated with antibiotics.
What could be the reasons for this?
1 It is not a bacterial disease.
2 The pathogen is a virus.
3 The patient has become resistant to the antibiotic.
(A)  1 and 2 only

(B) 1 and 3 only

(C) 2 and 3 only

(D)  1, 2 and 3

▶️Answer/Explanation

Ans: A

Question

What is the definition of a drug?
(A)  a substance produced by a gland that is carried in the blood and alters the activity of target organs
(B)  a substance produced by white blood cells that is carried in the blood and destroys bacteria and viruses
(C)  a substance taken into the body that modifies or affects chemical reactions carried out in the body
(D)  a substance that increases the rate of chemical reactions in the body and is not changed by the reaction

▶️Answer/Explanation

Ans : C

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