Question

Arrange the following structures according to their decreasing number.
$1.$ Hepatic or gastric caeca
$2.$ Malpighian tubules
$3.$ Ommatidia

• A. Malpighian tubule $>$ Ommatidia $>$ Hepatic caeca
• B. Ommatidia $>$ Malpighian tubule $>$ Hepatic caeca
• C. Hepatic caeca $>$ Ommatidia $>$ Malpighian tubule
• D. Malpighian tubule $>$ Ommatidia < Hepatic caeca

Answer 1

Answer: (B)

Hepatic caeca are 6 to 8 blind tubules present at the junction of foregut and midgut. At the junction of midgut and hindgut, 100 to 150 yellow-coloured thin filamentous malpighian tubules are present. Each compound eye of cockroach consists of about 2000 hexagonal ommatidia.