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
C.
Pharyngeal gill slits
Chordate animals, at some time in their life history, exhibit the following three diagnostic
charcters :
(1) Presence of notochord.
(2) Presence of dorsal tubular nerve cord.
(3) Presence of gill clefts during development.
Beside these, some other characters are :
(4) Ventral heart.
(5) Hepatic portal system.
Class Crustacea differs from lnsecta in having
two pairs of antennae
jointed foot
chitinous cuticle
none of the above
Sigmoid notch is formed by
cavity formed by humerus
cavity formed by radius-ulna
cavity formed by tibia-fibula
cavity formed by femur
If dorsal nerve of spinal cord is broken down then its effect is
no impulse is transmitted
impulse is transmitted but slowly
impulse is transmitted fast
no effect on impulse