A) nephral glands
B) nephridia
C) malpighian tubules
D) parotid gland
Correct Answer: C
Solution :
Excretion is a process of elimination of waste material of metabolism to external environment. Malpighian tubules are excretory organs of cockroach. These are extremly fine, yellow unbranched thread like structures present at the junction of midgut and hindgut. Nephridia are excretory organs present in members of phyllum Annelida eg, Earthworm. Parotid glands are salivary glands present in mammals and secrete saliva, which has enzyme ptylin (help in digestion of starch).
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