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In cockroaches, the circulatory system is best described as:
AClosed (blood flows only in vessels everywhere)
BOpen (haemolymph fills the body cavity haemocoel)
CDouble circulation (pulmonary + systemic)
DSingle circulation (heart → gills → body once)
Answer & Solution
Correct answer: B. Open (haemolymph fills the body cavity haemocoel)
Cockroaches (and most arthropods) have OPEN circulation: heart pumps haemolymph into the BODY CAVITY (haemocoel), where it bathes organs directly, then returns to heart. Closed circulation is in earthworm, vertebrates.
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