Question

Malpighian tubules remove excretory products from
A. Hemolymph
B. Alimentary canal
C. Both A and B
D. None of the above

Answer 1

Hint: Malpighian tubules are thin tubes usually found in arthropod food canals in the posterior regions. Each tubule consists of a single cell layer that is closed off at the distal end, at the junction between the midgut and the hindgut, with the proximal end joining the food canal. These are present for excretory waste removal in the cockroach.

Complete answer: Malpighian tubules help to extract wasteS from their body by producing urine and solid nitrogen wastes. It is a tube-like structure that stretches solid nitrogenous compounds, to the outside of the organism, excreting water and waste. Examples: cockroaches, grasshoppers and other insects, etc. Malpighian tubules are narrow tubes usually found in the arthropod food canals in the posterior regions. Every tubule comprises a separate cell layer that is sealed off at the distal end, at the junction between both the midgut and the hindgut, with the proximal end joining the food canal. The system of the Malpighian tubule consists of branching tubules extending from the food canal that absorbs the surrounding hemolymph solutes, water and waste. In the form of solid nitrogenous compounds, the waste is then released from the body. Malpighian tubules are excretory organs found in the cockroach. In hemolymph, they lie openly. They extract excretory materials from the hemolymph and open up at the junction of the midgut and the hindgut in the food canal. They are around 150 in number for each cockroach.
Hence, the correct answer is option A.

Note: Malpighian tubules have been modified in some insects to serve accessory functions. Larvae of all species in genus Arachnocampa use modified and swollen Malpighian tubules to produce a blue-green light.