EVERYDAY SCIENCE

Detailed explanation-1: -Molluscs have gills in their mantle cavity, which are used for respiration to exchange oxygen and carbon dioxide. Gills are employed by some bivalves for both filter feeding and breathing. Land molluscs have pulmonary sacs or cavities, which are aerial respiration organs.

Detailed explanation-2: -The gills of bivalve molluscs function in both a respiratory and a feeding role. Cilia are present on the gill filaments in the lateral, laterofrontal and frontal cells and each type have specific arrangements and functions.

Detailed explanation-3: -WHAT FEATURES DO MOLLUSKS HAVE IN COMMON? As well as a shell, most mollusks have a muscular foot for creeping or burrowing. Some also have a head with sense organs. The soft body includes lungs or gills for breathing, and digestive and reproductive parts, all enclosed by a skinlike organ called the mantle.

Detailed explanation-4: -Number of Gills: In Polyplacophora the number of gills varies from 6-80 pairs. In Monoplacophora the gills vary 3-6 pairs. In primitive gastropods, either two bipectinate (e.g., Pleurotomaria, Haliotis) gills or single bipectinate gill (e.g., Patella, Trochus, Nerita) are present.

Detailed explanation-5: -So respiration through the gills is known as branchial respiration. Gills are special vascularised structures that are used as respiratory organs by aquatic arthropods and molluscs.