Which of the following is correct ?

Options

A. All slime moulds are haploid
B. Protozoans-lack cell wall
C. Dinoflagellates are non-motile
D. Pellicle is absent in Euglena

Answer

To determine which of the statements provided is correct, let's analyze each option step by step.

### Step 1: Analyze the statement about slime molds
- **Statement**: All slime molds are haploid.
- **Explanation**: Slime molds belong to the kingdom Protista and can exist in both haploid and diploid forms during their life cycle. However, the dominant phase in many slime molds is indeed haploid.

### Step 2: Analyze the statement about protozoans
- **Statement**: Protozoans lack a cell wall.
- **Explanation**: This statement is incorrect. While many protozoans do not have a rigid cell wall like plants, they do possess a pellicle, which is a flexible outer layer that provides support and shape.

### Step 3: Analyze the statement about dinoflagellates
- **Statement**: Dinoflagellates are non-motile.
- **Explanation**: This statement is also incorrect. Dinoflagellates are known for their motility due to the presence of flagella. They are typically motile organisms.

### Step 4: Analyze the statement about euglena
- **Statement**: Pellicle is absent in euglena.
- **Explanation**: This statement is incorrect as well. Euglena has a pellicle, which is a flexible layer that helps maintain its shape and allows for movement.

### Conclusion
After analyzing all the statements, we find that the first statement about slime molds being haploid is the most accurate, although it is important to note that slime molds can also exist in a diploid state. The other statements regarding protozoans, dinoflagellates, and euglena are incorrect.

### Final Answer
The correct statement is: **All slime molds are haploid.**