Sporozoan protists are

Options

A. Parasitism
B. Without locomotory organs
C. With pseudopodia
D. Both A and B.

Answer

### Step-by-Step Solution:

1. **Understanding Sporozoan Protists**:
- Sporozoan protists are a group of unicellular organisms that are primarily known for their parasitic lifestyle. They belong to the phylum Apicomplexa.

2. **Characteristics of Sporozoans**:
- These organisms do not have locomotory organs such as cilia or flagella. Instead, they rely on their hosts for movement and transmission.
- They reproduce through a process called sporogony, which produces spores that can infect new hosts.

3. **Infective Stage**:
- The spore is the infective stage of sporozoans. For example, the genus Plasmodium, which causes malaria, has a spore-like stage known as the sporozoite that is transmitted through mosquito bites.

4. **Parasitism**:
- Sporozoans exhibit parasitism, meaning they live on or in a host organism and derive nutrients at the host's expense. This is a defining characteristic of sporozoans.

5. **Evaluating the Options**:
- **Option A**: Parasitism - This is correct as sporozoans are parasitic.
- **Option B**: Without locomotory organs - This is also correct since sporozoans do not have specialized structures for movement.
- **Option C**: With pseudopodia - This is incorrect as pseudopodia are characteristic of amoeboid organisms, not sporozoans.
- **Option D**: Both A and B - This is the correct choice since both statements about sporozoans are true.

6. **Conclusion**:
- Therefore, the correct answer is **Option D: Both A and B**.