Class Crustacea differs from lnsecta in having
two pairs of antennae
jointed foot
chitinous cuticle
none of the above
A.
two pairs of antennae
The main characteristics of class Crustacea and Insecta are as follows :
(1) Class Crustacea : Mostly aquatic with gills, two pairs of antennae and at least three pairs of jaws, appendages mostly biramous and always more than four in the trunk region. Example : prawn, crab, lobster etc.
(2) Class Insecta : Hexapod arthropods with a pair of antennae and three pairs of Jaws. Example : cockroach, grasshopper, bees,housefly etc.
Which of the following character is present essentialy in chordates
Ventral spinal chord
Dorsal heart
Pharyngeal gill slits
Blood flow in forward direction in ventral blood vessels
In contrast to annelids the platyhelminthes show
radial symmetry
presence of pseudocoel
bilateral symmetry
absence of body cavity
