Question

Find the incorrect statement among the following with respect to digestive system of frog.

• A. Food is captured by a bilobed tongue.
• B. Oesophagus is a long tube that opens into the stomach and continues as intestine.
• C. Liver secretes bile that is stored in gall bladder.
• D. The undigested solid waste moves into rectum and passes out through cloaca.

Hint:

Frogs lack a neck entirely. Therefore, any anatomical structure connecting the head to the body cavity (like the oesophagus) must inherently be very short.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept: The anatomy of a frog is highly adapted to its environment and body shape, resulting in specific structural differences compared to mammals.
Step 2: Key Formula or Approach: Critically evaluate the provided anatomical statements against the known specific morphology of a frog's digestive tract.
Step 3: Detailed Explanation: Statement (1) is correct: Frogs have a muscular, sticky, bilobed tongue attached at the front of the mouth used to snap at and capture prey.
Statement (3) is correct: Just like in humans, the frog's liver secretes bile which is temporarily stored in the gall bladder before being released.
Statement (4) is correct: The digestive tract ends with the rectum, which opens into a common chamber called the cloaca, from which solid waste is expelled.
Statement (2) is incorrect: While the oesophagus does connect the mouth to the stomach, it is fundamentally a very short tube in frogs, primarily because frogs completely lack a defined neck. Therefore, describing it as a "long tube" is anatomically wrong.
Step 4: Final Answer: The incorrect statement is (2).