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Which one requires intermediate host : 1...

Which one requires intermediate host : 1. Dugesia 2. Schistosoma 3. Echinococcus 4. Ancylostoma 5. Wuchereria.

A

3, 4

B

3, 5

C

1, 4

D

2, 5

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the listed organisms requires an intermediate host, we will analyze each option one by one: 1. **Dugesia**: - Dugesia, commonly known as planaria, does not require an intermediate host. It is a free-living flatworm and does not pose any danger to humans. Therefore, Dugesia is not the correct answer. 2. **Schistosoma**: - Schistosoma is a parasitic worm that does require an intermediate host. The intermediate hosts for Schistosoma are various species of freshwater snails. The life cycle of Schistosoma involves the shedding of eggs from the human host, which then hatch and penetrate the snails. Thus, Schistosoma is a correct answer. 3. **Echinococcus**: - Echinococcus is a type of tapeworm that does not require an intermediate host. The transmission occurs primarily through the consumption of contaminated food or water, particularly from fecal matter of infected dogs. Therefore, Echinococcus is not the correct answer. 4. **Ancylostoma**: - Ancylostoma, also known as hookworm, does not require an intermediate host. It typically infects humans directly through skin contact with contaminated soil. Thus, Ancylostoma is not the correct answer. 5. **Wuchereria**: - Wuchereria, which causes lymphatic filariasis, does require an intermediate host. The transmission of Wuchereria occurs through mosquitoes, which act as the intermediate host. Therefore, Wuchereria is also a correct answer. In conclusion, the organisms that require an intermediate host from the given options are **Schistosoma (2)** and **Wuchereria (5)**. ### Final Answer: The organisms that require an intermediate host are **Schistosoma (2)** and **Wuchereria (5)**.
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