The correct order of stages in life cycle of plasmodium is

Options

A. Gametocytes - gametes - ookinete oocyst - sporozoite
B. gametocytes - gametes - ookinete oocyst - merozoite
C. gametocytes - gametes - oocyst ookinete - sporozoite.
D. gametocytes - gametes - oocyst - sporozoite - ookinete

Answer

To determine the correct order of stages in the life cycle of Plasmodium, we need to understand the key stages involved in its life cycle, particularly focusing on the interactions between the mosquito and the human host.

### Step-by-Step Solution:

1. **Identify the Organisms Involved**:
- Plasmodium is a protozoan parasite that causes malaria. It has a complex life cycle involving two hosts: the female Anopheles mosquito (vector) and humans.

2. **Life Cycle Stages in Humans**:
- In humans, Plasmodium undergoes asexual reproduction. The stages include:
- **Gametocyte**: The sexual form of the parasite that develops in the human host.
- **Gametogenesis**: The gametocytes develop into gametes when taken up by a mosquito.

3. **Life Cycle Stages in Mosquito**:
- Once the mosquito ingests the gametocytes during a blood meal, the following occurs:
- **Fertilization**: The male and female gametes fuse in the mosquito's gut, forming a zygote.
- **Oocyst Formation**: The zygote develops into an oocyst.
- **Sporozoite Formation**: The oocyst eventually produces sporozoites, which migrate to the mosquito's salivary glands.

4. **Transmission to Humans**:
- When the mosquito bites a human, it injects the sporozoites into the bloodstream, where they can infect liver cells and continue their life cycle.

5. **Correct Order of Stages**:
- Based on the above information, the correct order of stages in the life cycle of Plasmodium is:
1. Gametocyte
2. Gamete
3. Oocyst
4. Sporozoite

### Conclusion:
Thus, the correct order of stages in the life cycle of Plasmodium is:
1. Gametocyte
2. Gamete
3. Oocyst
4. Sporozoite