NEET Practice Questions (MCQs) with Answers & Solutions

In echinoderms, tube feet are small, flexible, hollow appendages used for locomotion, feeding, and respiration. They are part of the water vascular system.

Lateral line sense organs are a system of tactile sense organs found in aquatic vertebrates like fish and some amphibians, including the shark Scoliodon. They detect water movements and vibrations.

The limbless amphibian is Icthyophis. Limbless amphibians are commonly known as caecilians. They belong to the order Gymnophiona, and Icthyophis is a genus within this order. These amphibians are adapted to a burrowing lifestyle, which is why they have lost their limbs.

Among reptiles, the crocodile has a four-chambered heart. While most reptiles have a three-chambered heart, crocodiles have evolved a four-chambered heart similar to that of birds and mammals. This adaptation allows for more efficient separation of oxygenated and deoxygenated blood, which is beneficial for their active lifestyle.

The Python is a non-poisonous snake. Unlike snakes such as cobras, kraits, and vipers, which possess venom to subdue their prey, pythons are constrictors. They kill their prey by wrapping around it and suffocating it through constriction.

Ostrich, Emu, and Kiwi are all flightless birds. Ostriches are native to Africa, Emus are native to Australia, and Kiwis are native to New Zealand. They have evolved to lose the ability to fly and have adapted to terrestrial living.

A mammal's heart is myogenic, meaning it has the ability to generate its own electrical impulses for contraction, independent of any nervous input. This is in contrast to neurogenic hearts, which rely on neural inputs to initiate contractions.

The second largest aquatic vertebrate is the Whale Shark. The largest is the Blue Whale, making the Whale Shark the second largest.

The egg-laying mammal referred to in the options is Oenithorhynchus, which is a misspelling of Ornithorhynchus, commonly known as the platypus. Platypuses are one of the few egg-laying mammals, also known as monotremes.