How many of the following statements are true w.r.t. fundamental features of chordates?
(a) Pharynx is perforated by gill slits.
(b) Heart is dorsal (if present).
(c) Post-anal tail is absent.
(d) Notochord is absent.
(e) Central nervous system is dorsal, hollow and single.

Choose the correct option.

One

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Two

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Three

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Four

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Solution

The correct option is B Two

S.No Chordates Non-chordates

1 Notochord present. Notochord absent.

2. Central nervous system is dorsal, hollow and single. Central nervous system is ventral, solid and double.

3. Pharynx perforated by gill slits. Gill slits are absent.

4. Heart is ventral. Heart is dorsal (if present).

5. A post-anal part (tail) is present. Post-anal tail is absent.

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S.No	Chordates	Non-chordates
1	Notochord present.	Notochord absent.
2.	Central nervous system is dorsal, hollow and single.	Central nervous system is ventral, solid and double.
3.	Pharynx perforated by gill slits.	Gill slits are absent.
4.	Heart is ventral.	Heart is dorsal (if present).
5.	A post-anal part (tail) is present.	Post-anal tail is absent.