Which stage of malarial parasite escapes digestion in stomach of mosquito ?

Options

A. Gametocytes
B. Trophozoites
C. Merozoites
D. Sporozoites

Answer

To answer the question "Which stage of malarial parasite escapes digestion in the stomach of the mosquito?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Malarial Parasite**: The malarial parasite is known as Plasmodium. There are several species, including Plasmodium vivax and Plasmodium falciparum.

2. **Understand the Life Cycle**: The life cycle of Plasmodium involves both humans and mosquitoes. The parasite is transmitted to humans through the bite of an infected female Anopheles mosquito.

3. **Stages of the Malarial Parasite**: The main stages of the Plasmodium life cycle include:
- **Gametocytes**: These are the sexual forms of the parasite.
- **Trophozoites**: These are the active feeding stages.
- **Merozoites**: These are the forms that invade red blood cells.
- **Sporozoites**: These are the forms that are injected into the human host during a mosquito bite.

4. **Ingestion by Mosquito**: When a female Anopheles mosquito bites a human, it ingests blood containing all these stages of the parasite, including gametocytes.

5. **Digestion in Mosquito Stomach**: Once inside the mosquito's stomach, most of the ingested material, including the different stages of Plasmodium, is digested. However, one stage is resistant to digestion.

6. **Identify the Resistant Stage**: The stage that escapes digestion in the mosquito's stomach is the **gametocyte**. This is the only stage that survives the digestive process and is crucial for the continuation of the parasite's life cycle.

7. **Conclusion**: Therefore, the stage of the malarial parasite that escapes digestion in the stomach of the mosquito is the **gametocyte**.

### Final Answer:
The stage of the malarial parasite that escapes digestion in the stomach of the mosquito is **gametocytes**.

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