Question

Study the following and identify the correct statements: I. During inspiration thoracic spiracles are kept closed. II. Oenocytes contain symbiotic bacteria. III. Stomodaeal valve lies between gizzard and mesenteron. IV. Alary muscles keep blood in circulation.

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

Hint:

Alary muscles help maintain haemolymph circulation in cockroach.

Answer 1

The Correct Option is B

Step 1: Check Statement I.
Thoracic spiracles remain open during inspiration. Hence Statement I is false.

Step 2: Check Statement II.
Symbiotic bacteria occur in mycetocytes, not oenocytes. Hence Statement II is false.

Step 3: Check Statement III.
The stomodaeal valve occurs between gizzard and mesenteron. Hence Statement III is true.

Step 4: Check Statement IV.
Alary muscles assist circulation of haemolymph. Hence Statement IV is true. Thus, \[ III \text{ and } IV \] are correct. \[ \boxed{\text{Option (B)}} \]