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Q1:
Draw a neat diagram of digestive system of frog.
Solution :
Anatomy of the Digestive System of a Frog (Rana tigrina)
The digestive system of a frog is highly specialized for a carnivorous diet, consisting of an alimentary canal and several digestive glands. The alimentary canal is short because frogs are carnivores, and the length of the intestine is reduced to facilitate rapid digestion [Per Biological Adaptation Theory].
Anatomical Components
- Alimentary Canal: Comprises the esophagus, stomach, intestine, and rectum.
- Digestive Glands: The liver (secretes bile) and the pancreas (secretes digestive enzymes).
Sequential Analysis of Digestion
| Organ | Function |
|---|---|
| Buccal Cavity | Captures prey via a bifid tongue; lubricates food with mucus. |
| Stomach | Secretes $HCl$ and gastric juices for protein digestion [Chemical Digestion Axiom]. |
| Small Intestine | Final digestion via bile and pancreatic juice; nutrient absorption through villi. |
| Rectum/Cloaca | Storage of undigested waste and elimination through the cloacal aperture. |
Physiological Justification
The secretion of digestive enzymes is triggered by the presence of food in the stomach. The liver produces bile, which is stored in the gall bladder until it is released into the duodenum to emulsify fats, thereby increasing the surface area for lipase action [Per Principle of Enzymatic Hydrolysis].
Final Solution: The digestive system of the frog is a complete alimentary canal, functionally adapted to process protein-rich insectivorous food, involving mechanical breakdown in the buccal cavity, chemical acid-pepsin digestion in the stomach, and enzymatic hydrolysis in the small intestine, ultimately terminating in the cloaca.
More Questions from Class 11 Biology Structural Organisation in Animals EXERCISES
CBSE Solutions for Class 11 Biology Structural Organisation in Animals
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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