In malarial eradication programme, the basis of using insecticide is to reduce lifespan of mosquito by less than
**Core Concept**
The malarial eradication programme relies on controlling the mosquito population to prevent disease transmission. The use of insecticides is a crucial component of this strategy, aiming to reduce the lifespan of mosquitoes to prevent them from transmitting the disease.
**Why the Correct Answer is Right**
The correct answer is based on the concept of the "extrinsic incubation period" of the malaria parasite. The extrinsic incubation period is the time required for the parasite to develop from the sporozoite stage to the infectious gametocyte stage within the mosquito. If the mosquito's lifespan is reduced to less than the extrinsic incubation period, the parasite will not have enough time to mature and be transmitted to humans. This is the basis for using insecticides to control malaria.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because reducing the mosquito's lifespan to less than the extrinsic incubation period is the primary goal of using insecticides in malarial eradication programmes.
**Option B:** This option is incorrect because it does not accurately describe the basis for using insecticides in malarial eradication programmes.
**Option C:** This option is incorrect because it does not provide a specific time frame for reducing the mosquito's lifespan.
**Clinical Pearl / High-Yield Fact**
To effectively control malaria, insecticides should be used to reduce the mosquito population and prevent the parasite from developing to the infectious gametocyte stage. This can be achieved by targeting the mosquito population before the extrinsic incubation period.
**Correct Answer: C. 24 hours.**