Frogs

Answer (a) A = Cytoplasm, B = Plasma membrane, C = Vitelline membrane; D = Yolk, E = Jelly Coat

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).