chordates and non-chordates

Question 1

based on what has the animal kingdom been divided into two sub-kingdoms? name the sub-kingdoms

Answer 1

based upon the presence or absence of notochord
chordates and non-chordates

Question 2

what is a notochord?

Answer 2

notochord is a long rod like supporting structure present on the dorsal side of an animal’s body
it keeps the nerve tissue isolated from thee remaining body

Question 3

by what is the body of chordates supported with?

Answer 3

notochord

Question 4

is the body of non-chordates supported with notochord?

Answer 4

no

Question 5

how do chordates respire?

Answer 5

pharyngeal gill slits or lungs are present for respiration

Question 6

do non chordates respire with pharyngeal gill slits?

Answer 6

no, pharyngeal gill slits are absent

Question 7

is nerve cord present in chordates? if yes, where? and how is it?

Answer 7

yes, dorsal side of the body
it is hollow

Question 8

where is nerve cord in non-chordates? how is it?

Answer 8

nerve cord, if present, is on ventral side of body
it is solid and paired

Question 9

where is heart in chordates?

Answer 9

ventral side of body

Question 10

where is heart in non-chordates?

Answer 10

if present, dorsal side of body