Which is not true about frog?

Options

A. Salivary glands are absent.
B. Maxillary teeth are arranged along the margin of upper jaw and the lower jaw is toothless.
C. Muscular tongue is bilobed at tip and free from behind.
D. The tadpole larva of frog has a short alimentary canal.

Answer

To determine which statement is not true about frogs, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Examine the First Option: "The salivary glands are absent."**
- Frogs do not have salivary glands. This statement is true.

2. **Examine the Second Option: "The maxillary teeth are arranged along the margin of the upper jaw, and the lower jaw is toothless."**
- The maxillary teeth are indeed located along the margin of the upper jaw in frogs, while the lower jaw does not have teeth. This statement is also true.

3. **Examine the Third Option: "The muscular tongue is bi-lobed at the tip and free from behind."**
- The frog's tongue is bi-lobed at the tip and is free at the back, allowing it to extend outwards to catch prey. This statement is true.

4. **Examine the Fourth Option: "The tadpole larva of a frog has a short elementary canal."**
- This statement is incorrect. The tadpole larva of a frog actually has a long elementary canal, which is adapted for its herbivorous diet.

### Conclusion:
The statement that is not true about frogs is the fourth option: "The tadpole larva of a frog has a short elementary canal."

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