Which of the following bacterial diseases is transmitted through the bite of an infected rat flea (Xenopsylla cheopis)? MCQ with Answer and Explanation

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Which of the following bacterial diseases is transmitted through the bite of an infected rat flea (Xenopsylla cheopis)?

A. Plague

B. Leprosy

C. Tetanus

D. Tuberculosis

Answer: Option A

Solution (By JKExamLibrary)

Plague is a severe zoonotic bacterial disease caused by Yersinia pestis. It is primarily transmitted to humans through the bite of infected rat fleas, most commonly Xenopsylla cheopis. The disease has three main forms: bubonic (swollen lymph nodes), pneumonic (lungs), and septicemic (blood). Tuberculosis is airborne, leprosy is transmitted via prolonged close contact, and tetanus enters through deep wounds.

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Question #1

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Identify the INCORRECT statement about the human ear:

A. The cochlea is responsible for balance.

B. The auditory nerve carries impulses to the brain.

C. The ossicles amplify sound vibrations.

D. The eardrum vibrates in response to sound waves.

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Correct Answer: Option A

Explanation:
The cochlea is for hearing; the vestibular apparatus (semicircular canals, utricle, saccule) is for balance. So C is incorrect.

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Question #2

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Which of the following vitamins is also known as 'retinol'?

A. Vitamin C

B. Vitamin A

C. Vitamin B₁

D. Vitamin D

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Correct Answer: Option B

Explanation:
Vitamin A is chemically known as retinol. It is essential for vision, immune function, and epithelial maintenance. Vitamin B₁ is thiamine, C is ascorbic acid, D is calciferol. Deficiency of vitamin A causes night blindness and xerophthalmia.

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Question #3

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Consider statements about human physiology: 1. The liver produces bile. 2. The pancreas produces insulin. 3. The gall bladder produces digestive enzymes. Which are correct?

A. 1 and 2 only

B. 1 and 3 only

C. 2 and 3 only

D. 1, 2 and 3

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Correct Answer: Option A

Explanation:
The liver continuously synthesizes bile, which is essential for fat emulsification. The pancreas acts as both an exocrine and endocrine gland; its Islets of Langerhans produce insulin and glucagon. The gall bladder only stores, concentrates, and releases bile; it does not produce any digestive enzymes. Thus, statements 1 and 2 are correct.

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