Question

Operculum is found in
A. Lobster
B. Fish
C. Snake
D. Sponge

Answer 1

Hint:Operculum is a structure which consists of a series of bones. It acts as a facial support structure in the organism and also provides protection as a covering layer. It also regulates the function of respiration and feeding.

Complete answer: Lobsters are marine animals that belong to the large family of crustaceans. The external body of the lobster is covered with a hard-protecting cover called an exoskeleton. The body of the lobster consists of a cephalothorax and abdomen. The cephalothorax is involved in the process of respiration. Thus, the operculum is not found in lobsters. So, option A is wrong.
Fishes are craniate aquatic animals. They possess gills and lack limbs with digits. Various types of fishes are bony fish, cartilaginous fish, lampreys, and hagfish. Fishes possess operculum for the process of respiration. They consist of four bone segments named preoperculum, sub operculum, interoperculum, and operculum. The operculum is mostly found in bony fishes. Therefore, option B is the correct answer.
The carnivorous reptiles which belong to the order Serpents that are long elongated and legless are called snakes. Snakes are amniote vertebrates that are covered in overlapping scales. The body of the snake is covered with overlapping scales. Due to the presence of skull in snakes, it makes it possible to swallow the prey which is much larger than their size. The jaws of the snake are highly mobile and have high flexibility. Therefore, option C is wrong.
The sponge is an animal that belongs to the phylum Porifera and kingdom Animalia. These are multicellular organisms that are characterized by the presence of pores all over the body of the organism. They are commonly referred to as pore bearers. They do not possess an operculum. Therefore, option D is wrong

So, option B is the correct option.

Note: Most of the snakes have only one functional lung. The respiration in snakes takes place with the help of the lungs. The body of the sponge is perforated and contains tiny pores called Ostia. The exchange of gas in the sponge takes place through Ostia.