What is a Malpighian tubule?
a. a filamentous projection of the mantle
b. an abdominal appendage in some arthropods that secretes silk
c. a muscular sac used for extending tube feet in echinoderms
d. a specialized tube in some arthropods that is used for waste processing
Ans: d. a specialized tube in some arthropods that is used for waste processing
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Which cells form a type of vascular tissue by joining end to end in tubelike columns, develop thick, lignified cell walls, and die at maturity, thus leaving an open-ended, water-conducting tube?
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