Select the incorrect statement out of the following.

Options

A. The reserve food material of fungi is glycogen.
B. Thallophytes include algae.
C. Locomotory organ of echinoderms is tube feet.
D. The skeleton of Hippocampus is made entirely of cartilage.

Explanation

To solve the question of selecting the incorrect statement from the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: The reserve food material of fungi is glycogen.**
- This statement is true. Fungi store their energy in the form of glycogen, similar to animals.

2. **Statement 2: Thalophytes include algae.**
- This statement is also true. Thalophytes are a group of simple plants that include algae, which are primarily aquatic and can perform photosynthesis.

3. **Statement 3: The locomotory organ of echinodermata is tube feet.**
- This statement is true. Echinoderms, such as starfish, use tube feet for locomotion. These structures are part of their water vascular system.

4. **Statement 4: The skeleton of hippocampus is made up of cartilage.**
- This statement is incorrect. The hippocampus, commonly known as the seahorse, is classified as a bony fish, which means its skeleton is primarily made of bone, not cartilage.

### Conclusion:
The incorrect statement is: **"The skeleton of hippocampus is made up of cartilage."**