Question

Which among the following is not correct about organ systems in mollusks?

(a) Pair of main nerve cords extends throughout their body

(b) Mollusks respire either through gills or mantle cavity

(c) Excretion occurs through malpighian tubules

(d) They have an open type of circulatory system

I got this question in semester exam.

I'm obligated to ask this question of Classification of Animal Kingdom into Different Phylum-4 topic in chapter Animal Kingdom of Biology – Class 11

Answer 1

Right option is (c) Excretion occurs through malpighian tubules

To elaborate: Pair of main nerve cords extends throughout their body. Mollusks respire either through gills or mantle cavity. Excretion occurs through nephridia. They have an open type of circulatory system.