Select the incorrect statement regarding cartilage.

Options

A. It is a tissue present at the ends of bones.
B. It acts as a shock absorber between the two bones.
C. It is present at tip of the nose.
D. It makes up the entire skeleton in some animals, such as whale.

Explanation

**Step-by-Step Solution:**

1. **Understand the Question**: The question asks for the incorrect statement regarding cartilage. We need to evaluate each statement provided.

2. **Evaluate Statement 1**: "It is a tissue present at the end of bones."
- This statement is correct. Cartilage is indeed found at the ends of bones, providing a smooth surface for joint movement.

3. **Evaluate Statement 2**: "It acts as a shock absorber between two bones."
- This statement is also correct. Cartilage helps absorb shock and reduces friction between bones during movement.

4. **Evaluate Statement 3**: "It is present at the tip of the nose."
- This statement is correct as well. The tip of the nose is made of cartilage, which allows it to be flexible.

5. **Evaluate Statement 4**: "The entire skeleton in some animals such as whales is made of cartilage."
- This statement is incorrect. While whales do have cartilage in their bodies, they are mammals and their skeletons are primarily made of bone, with only a small percentage (about 15%) made of cartilage.

6. **Conclusion**: The incorrect statement regarding cartilage is the fourth one, which claims that the entire skeleton of some animals, like whales, is made of cartilage.

**Final Answer**: The fourth statement is incorrect.

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