NEET Practice Questions (MCQs) with Answers & Solutions

Both the assertion and the reason are false. The water vascular system is not found in Aves (birds); it is characteristic of Echinoderms like starfish. Additionally, the water vascular system is not involved in blood circulation but rather in locomotion, feeding, and respiration in echinoderms.

In Balanoglossus, the excretory organs are not gills; instead, they possess glomerulus for excretion. Additionally, respiration in Balanoglossus occurs through gill slits and not through the proboscis. Therefore, both the assertion and the reason are false.

Cyclostomata, such as lampreys and hagfishes, do have an elongated body with 6-15 pairs of gill slits, but these gill slits are not involved in digestion. They are involved in respiration. Thus, the assertion is true, but the reason is false.

Cnidarians, such as jellyfish, corals, and sea anemones, exhibit radial symmetry. This means their body plan is arranged around a central axis, allowing them to interact with their environment from all directions equally. Hence, the correct option is o1: Radial.

The cavity in coelenterates (cnidarians) is called the coelenteron. It is a single internal cavity that serves both digestive and circulatory functions. Hence, the correct option is o1: coelenteron.

Sea anemones belong to the phylum Coelenterata, also known as Cnidaria. This phylum includes aquatic animals like jellyfish, corals, and hydras, which possess specialized cells called cnidocytes for capturing prey. Protozoa are single-celled organisms, Porifera includes sponges, and Echinodermata includes starfish and sea urchins, which are not related to sea anemones.

Nephridia in earthworms are excretory organs that perform a similar function to the flame cells in planaria. Both structures help in the removal of metabolic waste from the body. Gills in prawns are used for respiration, trachea in insects are for gas exchange, and nematoblasts in Hydra are involved in defense and prey capture, not excretion.

Taenia solium, commonly known as the pork tapeworm, belongs to the phylum Platyhelminthes. This phylum comprises flatworms, which are characterized by their flattened bodies. Aschelminthes includes roundworms, Annelids include segmented worms like earthworms, and Mollusca includes snails and octopuses.