SATHEE: Exemplar Problems

Biology Problems

Exemplar Problems

Question:

Explain the digestive system of Cockroach with the help of a labelled sketch.

Answer:

The digestive system of a cockroach is composed of several parts that work together and extract nutrients from the food it consumes.

Following is a step-by-step explanation of each component:

Mouthparts: The process of digestion begins with the mouthparts of the cockroach. These include mandibles and maxillae, which are used to break down food into smaller pieces. The saliva secreted by the salivary glands contains enzymes that initiate the digestion of carbohydrates.

Foregut:

a. Pharynx: The crushed food moves from the mouth to the pharynx, which is the throat-like structure.

b. Esophagus: From the pharynx, the food passes into the esophagus, which is a narrow tube connecting the pharynx to the crop.

c. Crop: The crop is a storage organ where the food is temporarily stored. It allows the cockroach to ingest a large amount of food at once and process it gradually.

Midgut:

a. Proventriculus: The proventriculus is a valve-like structure that regulates the movement of food from the crop to the midgut.

b. Gizzard: The gizzard is a muscular organ that grinds and further breaks down the food using mechanical action. This is where food is mixed with digestive enzymes and becomes chyme.

Hindgut:

a. Stomach (or ventriculus): The chyme passes from the gizzard to the stomach, where further digestion takes place. Enzymes and digestive fluids break down the food into simpler nutrients.

b. Malpighian Tubules: These are excretory structures connected to the junction between the midgut and hindgut. They help in removing waste and excess water from the body.

c. Ileum and Colon: The chyme then moves through the ileum and colon, where the absorption of nutrients and water occurs.

d. Rectum: The rectum stores fecal matter before it is eliminated from the body.

Anus: The undigested waste, or feces, is expelled from the body through the anus.

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Biology Problems

Exemplar Problems

Question:

Answer:

Table of Contents

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Mentorship

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