Draw a neat diagram of digestive system of frog.
The digestive system of frog consists of the alimentary canal and digestive glands. A neat diagram should be drawn showing all the organs properly labeled.
The alimentary canal begins with the mouth which opens into the buccal cavity. This leads to the pharynx and then to the oesophagus, which is a short tube. The oesophagus opens into the stomach, which continues as the intestine, followed by the rectum, and finally opens outside through the cloaca.
The digestive glands include the liver and pancreas. The liver secretes bile which is stored in the gall bladder. The pancreas is a digestive gland that produces pancreatic juice.
The alimentary canal is short in frogs because they are carnivores, and hence the length of intestine is reduced. The diagram should clearly show the complete digestive system with all parts properly labeled.
Explanation
This is a 5-mark diagram-based question from NCERT Class 11 Biology Chapter 7 (Structural Organisation in Animals). The textbook describes the digestive system as consisting of the alimentary canal and digestive glands. The diagram (Figure 7.2 in the textbook) shows the internal organs of frog with the complete digestive system. Key labels include: mouth, buccal cavity, pharynx, oesophagus, stomach, intestine, rectum, cloaca, liver, gall bladder, and pancreas. Students should draw a neat labeled diagram showing the pathway of the alimentary canal and position of digestive glands.
Solution Steps
Step 1: Draw the outline of the alimentary canal starting from mouth to cloaca
Step 2: Show the buccal cavity, pharynx, oesophagus, stomach, intestine, and rectum in sequence
Step 3: Draw the digestive glands - liver with gall bladder and pancreas
Step 4: Label all parts clearly: mouth, buccal cavity, pharynx, oesophagus, stomach, intestine, rectum, cloaca, liver, gall bladder, pancreas
Step 5: Add a title 'Digestive System of Frog' and ensure neatness