Which was is spindle-shaped mobile with microtubules

Options

A. Sporont
B. Ookinete
C. Cryptozoite
D. Sporozoite.

Answer

To answer the question "Which is spindle-shaped mobile with microtubules?" we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: The question pertains to the life cycle of a malarial parasite. The primary organism responsible for malaria is *Plasmodium*.

2. **Know the Vector**: The vector for *Plasmodium* is the female *Anopheles* mosquito. Understanding the role of the mosquito is crucial as it is where the infective stage of the parasite develops.

3. **Locate the Structure**: In the salivary glands of the female *Anopheles* mosquito, there are specific structures that are spindle-shaped and mobile. These structures are crucial for the transmission of malaria to humans.

4. **Identify the Spindle-Shaped Structure**: The spindle-shaped mobile structure in question is known as the **sporozoite**. The sporozoite is the infective stage that is injected into humans when the mosquito bites.

5. **Understand the Mobility**: The mobility of the sporozoite is due to its wriggling motion, which allows it to penetrate liver cells effectively. This shape and motion are essential for its function in the life cycle of the parasite.

6. **Microtubules Presence**: The sporozoite contains microtubules, which are structural components that provide support and facilitate movement. Different species of *Plasmodium* have varying numbers of microtubules.

7. **Conclusion**: Based on the above points, the correct answer to the question is the **sporozoite** of *Plasmodium*.

### Final Answer:
The spindle-shaped mobile structure with microtubules in the life cycle of the malarial parasite is the **sporozoite**.

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