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Question

Which of the following statements are correct regarding chordates?

A
Heart, if present, is on the dorsal side.
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B
Pharyngeal gill-slits or lungs are present for respiration.
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C
Pharyngeal gill-slits are absent.
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D
A hollow nerve cord is present on the dorsal side.
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Solution

The correct options are
B Pharyngeal gill-slits or lungs are present for respiration.
D A hollow nerve cord is present on the dorsal side.
Depending upon presence or absence of the notochord, the animal kingdom has been divided into two groups- Non-chordates and Chordates. The defining characteristics of a chordate are:
1. The presence of notochord
2. Pharyngeal gill-slits or lungs present for respiration.
3. A hollow nerve cord present on dorsal side of body.
4. Heart that is present on the ventral side of body.

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