Identify the incorrect pair.

Options

A. Trypanosoma - protrozoan
B. Plankton-Float passively
C. Gonyaulax - Chitinous cell wall
D. Slime moulds - Saprophytic protists

Answer

To solve the question "Identify the incorrect pair," we will analyze each option provided in the question and determine if they are correctly paired or not.

### Step-by-Step Solution:

1. **Analyze the First Pair: Trypanosoma - Protozoan**
- Trypanosoma is a genus of flagellate protozoa. It is indeed classified under the kingdom Protista and is known for causing diseases such as sleeping sickness.
- **Conclusion:** This pair is correctly matched.

2. **Analyze the Second Pair: Plankton - Float Passively**
- Plankton refers to small organisms that drift in water bodies. They do not swim against currents and are carried along by tides and currents.
- **Conclusion:** This pair is also correctly matched.

3. **Analyze the Third Pair: Gonia lex - Diatom**
- Gonia lex is a genus of diatoms. Diatoms are a type of algae characterized by their silica cell walls. However, the statement in the transcript mentions that most diatoms have a non-membranous cell wall, which is misleading. Diatoms do have a cell wall, but it is made of silica and is not considered "non-membranous" in the traditional sense.
- **Conclusion:** This pair is incorrectly matched.

4. **Analyze the Fourth Pair: Slime Molds - Protist**
- Slime molds are indeed classified as protists. They are saprophytic organisms that feed on decaying organic matter and are known for their unique life cycle.
- **Conclusion:** This pair is correctly matched.

### Final Conclusion:
The incorrect pair is **Gonia lex - Diatom**.