The CORRECT statement about the digestive system of cockroach are ,
I. The entire foregut of the cockroach is lined by the cuticle.
II. The midgut is broader than the hindgut of the cockroach.
III. The proventriculus of the cockroach has teeth for grinding food particles.
IV. The digestive juice is secreted by 100 - 150 hepatic caeca present at the junction of foregut and midgut.

Options

A. I and III
B. II and IV
C. I and II
D. III and IV

Answer

To determine the correct statements about the digestive system of a cockroach, let's analyze each statement one by one.

**Step 1: Analyze Statement I**
- Statement I: "The entire foregut of the cockroach is lined by the cuticle."
- The foregut of the cockroach does indeed have a lining of cuticle, which is a characteristic of many insects. Therefore, this statement is **correct**.

**Step 2: Analyze Statement II**
- Statement II: "The midgut is broader than the hindgut of the cockroach."
- In cockroaches, the hindgut is actually broader than the midgut. The midgut is relatively narrow compared to the hindgut. Thus, this statement is **incorrect**.

**Step 3: Analyze Statement III**
- Statement III: "The proventriculus of the cockroach has teeth for grinding food particles."
- The proventriculus, which is part of the foregut, does have structures that function like teeth (called "grinding plates") to help grind food particles. Therefore, this statement is **correct**.

**Step 4: Analyze Statement IV**
- Statement IV: "The digestive juice is secreted by 100 - 150 hepatic caeca present at the junction of foregut and midgut."
- The hepatic caeca are present at the junction of the midgut and hindgut, and there are typically around 6 to 7 of them, not 100 to 150. Hence, this statement is **incorrect**.

**Conclusion:**
- The correct statements about the digestive system of the cockroach are:
- Statement I: Correct
- Statement II: Incorrect
- Statement III: Correct
- Statement IV: Incorrect

Thus, the correct answer includes statements I and III.

**Final Answer:**
The correct statements are I and III.

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