Mark the mis-matched pair

Options

A. Pyrocystis - Bioluminescence
B. Whirling whips - Soap box like body structure
C. Diatomite - Kieselguhr
D. Gymnodinium - Zygotic meiosis

Answer

To solve the question of marking the mismatched pair, we will analyze each of the provided pairs step by step.

### Step-by-Step Solution:

1. **Analyze the First Pair: Pyrocystis and Bioluminescence**
- Pyrocystis is known for its ability to exhibit bioluminescence. This is a correct match because Pyrocystis is a type of dinoflagellate that emits light, especially in marine environments.

2. **Analyze the Second Pair: Whirling Whips and Body Structure**
- The term "whirling whips" refers to a type of dinoflagellate. However, their body structure is not characterized by a flexible body but rather by a rigid coat known as theca. This indicates that this pair is mismatched.

3. **Analyze the Third Pair: Diatomite and Kieselguhr**
- Diatomite is indeed another name for kieselguhr, which is a soft, siliceous sedimentary rock made from diatom remains. This is a correct match.

4. **Analyze the Fourth Pair: Gymnodinium and Digotic Mucus**
- Gymnodinium is a genus of dinoflagellates, and they can produce mucous. This pair is also correctly matched.

### Conclusion:
After analyzing all pairs, the mismatched pair is **Whirling Whips and Body Structure** (Option B).