Question

Observe the relation between the first two words and complete the analogy. 
Dengue: Aedes :: Plague: __________
 

Hint:

Biological analogies usually require the vector or the causative agent; read the first pair carefully to identify the relationship.

Answer 1

Step 1: Understand the relationship in the first pair.
The pair Dengue : Aedes shows the relationship between a disease and the organism that transmits it. Dengue fever is transmitted to humans by the Aedes mosquito, which acts as the vector of the disease.

Step 2: Apply the same relationship to the second pair.
Similarly, Plague is also a disease that spreads through a specific vector. The plague bacterium (Yersinia pestis) is transmitted mainly by the rat flea, scientifically known as Xenopsylla cheopis.

Step 3: Complete the analogy.
Since Dengue is transmitted by the Aedes mosquito, Plague is transmitted by the rat flea.

Final Answer:
Dengue : Aedes :: Plague : Rat flea (Xenopsylla cheopis).