A) coxal gland
B) flame cells
C) Malpighian tubule
D) nephridia
Correct Answer: A
Solution :
Spiders belong to the order Araneae of class Arachnida. They have the coxal glands as excretory organ. They excrete guanine and therefore called guanotelic. The silk secreted by most spiders is used for constructing webs to trap insects as guide lines for males in finding sexual partners and for the construction of egg Malpighian tubules are principal excretory organs in insects, centipedes, millipedes and arachnids, Flame cells are characteristic feature of phylum Platyhelminthes as excretory organ. The flame cells open into the excretory duct. The metanephridia also called nephridia are excretory organs of Annelids. Nephridium starts from a rounded ciliated funnel, the nephrostome which opens into coelom. A nephridium opens outside the body through a small aperture called nephridiopore.
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