Govt. Exams
Entrance Exams
During embryonic development, the notochord is replaced by the vertebral column in adult vertebrates, though remnants persist as the nucleus pulposus of intervertebral discs.
Annelida possesses true coelom (eucoelomate) and bilateral symmetry, unlike Porifera (no symmetry), Cnidaria (radial symmetry), and Platyhelminthes (pseudocoelom or acoelomate).
Reptiles produce amniotic eggs with protective membranes and shells, reducing dependence on aquatic environments. This is a key adaptation distinguishing them from amphibians that require water for reproduction.
Cnidocytes contain nematocysts (stinging cells) that fire to capture, paralyze, and kill prey. This is a defining characteristic of the phylum Cnidaria.
The correct hierarchical order of biological classification follows the sequence: Kingdom, Phylum, Class, Order, Family, Genus, and Species from largest to smallest taxonomic units.
The gastrodermis (or endoderm) is the inner layer of sponges that lines the spongocoel and contains choanocytes for filter feeding.
Feathers are unique to birds and are not found in any other vertebrate group. While other animals lay eggs or have hollow bones, only birds possess true feathers.
Gills are specialized respiratory organs that extract dissolved oxygen from water for gas exchange, which is their primary function.
Echinoderms possess a unique water vascular system (hydraulic system) used for locomotion and feeding, not found in other phyla.
During embryonic development, the notochord is replaced by the vertebral column (spine) in vertebrates, forming the axial skeleton.
