Question Statement

Choose the option that shows the correct pairing of the diseases with their corresponding causative organisms.

P. Chagas disease i. Trypanosoma gambiense

Q. Sleeping sickness ii. Plasmodium falciparum

R. Malaria iii. Yersinia pestis

S. Plague iv. Trypanosoma cruzi

(A) P-iv, Q-i, R-iii, S-ii (B) P-iv, Q-i, R-ii, S-iii

(C) P-i, Q-iv, R-ii, S-iii (D) P-i, Q-iv, R-iii, S-ii

Chagas disease pairs with Trypanosoma cruzi, sleeping sickness with Trypanosoma gambiense, malaria with Plasmodium falciparum, and plague with Yersinia pestis. Option B matches these pairings exactly.

Correct Pairings

• P. Chagas disease → iv. Trypanosoma cruzi: This protozoan parasite causes American trypanosomiasis, transmitted by triatomine bugs in Latin America.

• Q. Sleeping sickness → i. Trypanosoma gambiense: Primarily the West African form of human African trypanosomiasis, spread by tsetse flies.

• R. Malaria → ii. Plasmodium falciparum: The most severe human malaria parasite, transmitted by Anopheles mosquitoes.

• S. Plague → iii. Yersinia pestis: A gram-negative bacterium causing bubonic, septicemic, or pneumonic plague via flea bites.

Option Analysis

Option (A) P-iv, Q-i, R-iii, S-ii: Incorrect. Malaria links to Plasmodium falciparum (ii), not Yersinia pestis (iii); plague links to Yersinia pestis (iii), not Plasmodium falciparum (ii).

Option (B) P-iv, Q-i, R-ii, S-iii: Correct. All pairings align with established causative agents.

Option (C) P-i, Q-iv, R-ii, S-iii: Incorrect. Chagas disease matches Trypanosoma cruzi (iv), not Trypanosoma gambiense (i); sleeping sickness matches Trypanosoma gambiense (i), not Trypanosoma cruzi (iv).

Option (D) P-i, Q-iv, R-iii, S-ii: Incorrect. Combines errors from (A) and (C).

Diseases and causative organisms matching forms a critical topic in CSIR NET Life Sciences exams, testing knowledge of infectious agents like protozoa and bacteria. This guide covers Chagas disease, sleeping sickness, malaria, and plague with their precise causative organisms, helping students ace matching questions.

Pathogen Profiles

These diseases feature distinct transmission and agents:

• Chagas disease by Trypanosoma cruzi (protozoan, triatomine vector).

• Sleeping sickness by Trypanosoma gambiense (protozoan, tsetse fly).

• Malaria by Plasmodium falciparum (protozoan, mosquito).

• Plague by Yersinia pestis (bacterium, flea).

Exam Strategies

For diseases and causative organisms matching, memorize vector-agent links and regional prevalence. Practice options systematically to spot mismatches quickly.