A) trochophore
B) typhlosole
C) clitellum
D) trachea
E) nephridium
Correct Answer: B
Solution :
Typhlosole is a highly glandular, vascular, longitudinal ridge increasing the area for absorption of digested food. Typhlosolar region is from 27th segment onwards and continue upto last 23-25 segments in front of anus. Clitellum is a thick glandular band around the earthworm secreting the cocoon. Nephridium is a tubular excretory organ of earthworm and other annelids, with an external opening and with or without an internal opening. Trochophore is a free swimming ciliated marine larva characteristic of polychaete, annelids and most molluscs. Trachea or windpipe is a part of respiratory system in man, tracheae (in insects, cockroach).
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