Zoology MCQs for NEET — Practice Questions with Answers

Lampreys have a sucking and circular mouth without jaws. This is a distinctive feature of this jawless fish (agnathan) group.

In poriferans, the spongocoel is lined with flagellated cells called choanocytes. These cells are crucial for water circulation and nutrient capture within the sponge. The flagella of choanocytes create water currents that help in the movement of water through the sponge's body, allowing it to filter out food particles from the water.

Chondrichthyes, also known as cartilaginous fishes, are characterized by having a ventral mouth and placoid scales. Placoid scales are small, tooth-like structures that cover the skin, providing protection and reducing friction while swimming. The ventral mouth is located on the underside of the head.

Air bladder is absent in dogfish. Dogfish is a type of cartilaginous fish (Chondrichthyes), which lack air bladders. Instead, they rely on their liver, which is rich in oil, to maintain buoyancy. In contrast, bony fish (Osteichthyes) often have an air bladder that helps them regulate buoyancy.

The seahorse is a type of fish. It belongs to the genus Hippocampus, which is a genus of small marine fish. Seahorses have a bony structure and swim upright, which is characteristic of fish. They are not birds, mammals, or amphibians.

Seahorses are cold-blooded animals. This means their body temperature is regulated by the external environment. Unlike mammals like horses and bats, which are warm-blooded, seahorses depend on the surrounding water to maintain their body temperature.

The term 'Amphibia' comes from the Greek words 'amphi' meaning 'dual' and 'bios' meaning 'life'. This name reflects the dual life that amphibians lead, spending part of their life in water (as larvae) and part on land (as adults).

Ichthyophis is a genus of limbless amphibians, also known as caecilians. These are elongated, worm-like amphibians that lack limbs, and they belong to the order Gymnophiona.

Amphibians can respire through gills, lungs, and skin. During their larval stage, they typically use gills, and as adults, they use lungs and their skin for respiration. This makes option o4 (All the above) the correct answer.

Reptiles (Reptilia) have dry skin covered with scales or scutes and generally lack glands. This is a distinguishing characteristic that separates them from other classes such as Aves, Pisces, and Mammals.