Question 53
Microorganisms and HealthOil is sprayed over stagnant water in which mosquitoes breed in order to
- A.provide landing surface for the adult
- B.prevent larva or pupa from attaching itself to the surface
- C.prevent the water from overheating
- D.lubricate the larva for easy movement
- E.provide surface for laying their eggs
Show the answer and explanation
Answer: B (prevent larva or pupa from attaching itself to the surface)
Explanation
Larvae and pupae hang from the water surface to breathe; the oil film stops them attaching, so they suffocate.