NEET Practice Questions (MCQs) with Answers & Solutions

Ascaris, a parasitic roundworm, is commonly found in the alimentary canal of its host. Specifically, it resides in the small intestine where it feeds on the host's digested food. This is a key point for NEET students to remember as it highlights the parasite's habitat and its impact on the host's digestive system.

In Pheretima (earthworm), locomotion occurs with the help of circular muscles, longitudinal muscles, and setae. The coordinated contraction and relaxation of these muscles, along with the anchoring action of the setae, enable the earthworm to move through soil. Understanding this mechanism is crucial as it demonstrates the complex interaction of different muscular and structural components in annelid locomotion.

A body cavity lined by mesoderm is called a coelom. This is a true body cavity found in coelomate animals, which allows for the development of complex structures and organ systems. NEET students should note the distinction between coelomates and other types of body plans, such as pseudocoelomates and acoelomates, for a comprehensive understanding of animal anatomy.

Insects are the most diverse group of animals on Earth, with nearly a million described species and many more yet to be discovered. This makes them the group with the highest number of species in nature.

Prawns are crustaceans, which are a large, diverse group of arthropods that also include crabs, lobsters, and shrimp. Crustaceans typically have a hard exoskeleton and jointed limbs.

The excretory organs in cockroaches are Malpighian tubules. These tubules are responsible for the removal of waste products from the hemolymph (insect blood) and help in osmoregulation.

Animals that are active during the night are called 'nocturnal'. They have adapted to low light conditions and often have enhanced senses like improved vision or hearing to navigate and hunt in the dark. Examples include owls, bats, and many rodents.

The salient feature of Arthropoda is the presence of a chitinous exoskeleton and jointed appendages. This exoskeleton provides structural support and protection, while the jointed appendages allow for complex movements. These features are key to the success and diversity of the arthropod phylum, which includes insects, arachnids, and crustaceans.

The scientific name of a starfish is 'Asterias'. Starfish belong to the class Asteroidea within the phylum Echinodermata. They are known for their star-shaped body and ability to regenerate lost arms.

Echinoderms are a phylum of marine animals that include starfish, sea urchins, and sea cucumbers. They are exclusively found in marine environments.