All chordates at one or other stage possess
two pairs of pentadactyl limbs
pharyngeal gill slits
movable jaw
vertebral column
B.
pharyngeal gill slits
In all the chordates, at some stage of their life history, a series of paired lateral gill clefts or gill slits perforate through the pharyngeal wall of the gut behind the mouth. They serve primarily for the passage of water from pharynx to outside.
Haemocyanin pigment is found in which of the following animal group?
Annelida
Insects
Lower invertebrates
Platyheliminthes
Identify the incorrect match
Mulberry silk - Bombyx mori
Tasar silk - Antheraea pernyi
Muga silk - Antheraea assama
Eri silk - Attacus ricini
Mammals have
biconvex RBCs to increase the surface area
biconcave RBCs to increase the surface area
spherical RBCs to increase the surface area
no RBCs
A fish introduced into a water body to control mosquito population is
Gambusia
Labeo
Notopterus
Fistularia
Aristotle's lentern is
pedicellariae in Pycnopodia
arval form in Antedon
pressure equalisation plate in Asterias
masticatory organ in the digestive tract of sea urchin
Ornithorhynchus is a connecting link between
fishes and amphibians
Annelida and Arthropoda
Annelida and Mollusca
reptiles and mammals
