Point out the correct sequence of events of sporogony.

Options

A. Zygote, ookinete, oocyst, sporozoite
B. Zygote, oocyst, ookinete, sporozoite
C. Ookinete, sporozoite, oocyst, sporoblast
D. Zygote, sporozoite, ookinete, oocyst.

Answer

To point out the correct sequence of events of sporogony in the life cycle of the malaria parasite Plasmodium, we can break down the process into the following steps:

### Step-by-Step Solution:

1. **Injection of Sporozoites**: The process begins when the female Anopheles mosquito bites a human and injects the sporozoites into the bloodstream. These sporozoites are the infective form of the parasite.

2. **Fertilization of Gametes**: Inside the mosquito, male and female gametes of Plasmodium fuse together. This fusion occurs in the mosquito's gut and leads to the formation of a zygote.

3. **Formation of Zygote**: The zygote is the first diploid cell formed after the fusion of male and female gametes.

4. **Development into Ookinetes**: The zygote develops into a motile form called an ookinete, which then penetrates the mosquito's gut wall.

5. **Formation of Oocysts**: After the ookinete penetrates the gut wall, it develops into an oocyst. This is a protective cyst that allows the parasite to develop further.

6. **Sporozoite Formation**: Inside the oocyst, multiple sporozoites are produced through a process of asexual reproduction.

7. **Release of Sporozoites**: Once the oocyst is mature, it bursts, releasing the sporozoites into the mosquito's hemolymph.

8. **Injection into the Human Host**: Finally, when the mosquito bites another human, it injects the sporozoites through its saliva, starting the cycle anew.

### Correct Sequence of Events:
1. Zygote
2. Ookinete
3. Oocyst
4. Sporozoites