Question

Which of the following for bed-bug, leech and mosquito?
(A) All are parasite
(B) All have anticoagulant property
(C) All are blood sucking animals
(D) All of the above

Answer 1

Hint: In the question, the mosquito is a flying insect, the leeches are the type of the worms and the bed-bug is the non flying insects. Among these the mosquito are commonly seen in many areas troubling the humans and also transmit many diseases.

Complete Answer:
- The bed- bug, mosquito and the leeches are the external parasites. That means they depend on the other organisms for their nutrition but live in the external environment.
- They all depend on the human and the other animals by sucking their nutritive blood and hence they are blood sucking organisms.
- They have the sucking feature in their mouth parts. The bed bug is provided with the sucking type of mouth and the mosquito has proboscis which is the sharp structure that punctures the skin of the humans and sucks the blood through it.
- The leeches are provided with the oral structures in the mouth for the purpose of sucking. All these organisms have the anticoagulant in their saliva. Hence the blood in them remains in an uncoagulated liquid form. Hence all the answers given are correct.

Thus the option (D) is correct.

Note: When the mosquito bites the infected person and after that the healthy normal person, they are capable of transmitting the diseases like malaria, dengue etc. through the blood. These pathogens of the disease have the life cycle in the body of the mosquito too.