EVERYDAY SCIENCE

Detailed explanation-1: -Molluscs living in water breathe through ctenidia. These are the mantle’s comb-like protrusions that are found inside the mantle space. The cilia’s beating causes the water to travel through the mantle cavity. Afferent and efferent blood arteries can be seen in each ctenidium, and they pass through the ctenidial axis.

Detailed explanation-2: -A ctenidium is a respiratory organ or gill which is found in many molluscs. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snails and marine snails.

Detailed explanation-3: -We can say that the function of Ctenidia is to increase the space inside the body and help in respiration. However, the phylum of Arthropoda, Annelida, and Porifera have specific body parts that help in respiration.

Detailed explanation-4: -Molluscs breathe with gills called ctenidia that sit in a cavity between the mantle and body mass (Fig. 3.57). In some molluscs, most notably bivalves like oysters and mussels, the ctenidia are also used as filter feeding apparatus to strain particulate food from the water.

Detailed explanation-5: -The correct answer is Mollusca. Aquatic molluscs respire through ctenidia. It is also known as Molluscan gill.