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Vectors are...

Vectors are

A

Physalia, Musca domestica and Anopheles

B

Amoeba, Physalia and Musca

C

Anopheles, Musca and Culex

D

All the above.

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Term "Vectors":** - Vectors are organisms that carry and transmit pathogens (disease-causing agents) to other living organisms. They play a crucial role in the transmission of various diseases. 2. **Analyzing the Options:** - **Option 1: Physalia, Musca, Domestica** - Physalia (Portuguese man o' war) belongs to the phylum Cnidaria and is not a vector for pathogens. Therefore, this option is incorrect. - **Option 2: Amoeba, Physalia, Musca** - Amoeba is a protozoan and does not act as a vector. Physalia is also not a vector. Thus, this option is incorrect. - **Option 3: Anopheles, Musca, Culex** - Anopheles mosquitoes are known vectors for malaria, Musca (housefly) can transmit diseases like dysentery, and Culex mosquitoes can transmit filariasis. This option is correct as all three are recognized vectors. - **Option 4: All of the above** - Since the first two options are incorrect, this option is also incorrect. 3. **Conclusion:** - The correct answer is **Option 3: Anopheles, Musca, and Culex** as they are all vectors that transmit various diseases.
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