Classification of Animal Kingdom MCQs for NEET — Zoology Questions with Answers

The NCERT text mentions that chordates are 'bilaterally symmetrical'. While the other options are distinctly chordate features, bilateral symmetry is a characteristic found in many non-chordate phyla as well (e.g., Platyhelminthes, Annelida, Arthropoda, Mollusca as per the 'Summary' and Table 4.2).

The NCERT text states, 'The members of subphylum Vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.'

Table 4.1 explicitly lists 'A post-anal part (tail) is present' as a characteristic of Chordates, while Non-chordates lack a post-anal tail.

The initial description of Chordata states, 'They possess a post anal tail and a closed circulatory system.'

Table 1.1 provides the taxonomic categories for Man: Phylum - Chordata, Class - Mammalia, Order - Primata, Family - Hominidae, Genus - Homo, Species - Homo sapiens. The correct ascending order from Phylum is Chordata, Mammalia, Primata, Hominidae, Homo, Homo sapiens.

According to the NCERT text, 'Circulatory system is of open type' in Hemichordata. This means that the blood flows through open spaces (sinuses) rather than being confined to blood vessels throughout its circuit.

The NCERT text states, 'Respiration takes place through gills' for Hemichordata. Options o1, o2, and o4 are characteristic respiratory/excretory structures of Arthropods.

The NCERT text explicitly mentions, 'Excretory organ is proboscis gland' for Hemichordata. Flame cells are found in Platyhelminthes, and metanephridia in Annelids.

The term 'Sexes are separate' in biology is synonymous with dioecious, meaning male and female reproductive organs are in separate individuals. Hermaphroditic or monoecious implies both sexes are in the same individual.

The NCERT text states, 'Development is indirect' for Hemichordata. Indirect development typically implies the presence of a larval stage before reaching the adult form.