Question

Study the following and identify the correct statements I. Between ventriculus and gizzard of cockroach, there are Malpighian tubules II. In cockroach rectal papillae help in water conservation III. In cockroach due to contraction of dorso-ventral muscles mandibles move IV. Hollow chitinous tubes of wings of cockroach are called nervures

• A. II, IV
• B. I, III
• C. III, IV
• D. I, II

Hint:

Rectal papillae conserve water, while nervures are chitinous supporting veins present in insect wings.

Answer 1

The Correct Option is A

Concept: Cockroach anatomy includes several specialized structures associated with digestion, excretion, locomotion and water balance.

Step 1: Examine Statement I. Malpighian tubules arise at the junction of midgut and hindgut. They are not located between ventriculus and gizzard. Hence Statement I is false.

Step 2: Examine Statement II. Rectal papillae reabsorb water and salts from fecal matter. This mechanism helps conserve water. Hence Statement II is true.

Step 3: Examine Statement III. Mandibles move due to contraction of adductor and abductor muscles, not specifically because of dorso-ventral muscles. Hence Statement III is false.

Step 4: Examine Statement IV. The wings contain hollow chitinous tubes called nervures. These provide support and carry nerves and tracheae. Hence Statement IV is true.

Step 5: Final conclusion. Correct statements are: \[ II \text{ and } IV \] Hence option (A) is correct.