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Animal Kingdom

Question

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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

Solution

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.

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