Question

The following are the statements about non-chordates:

1. Pharynx is perforated by gill slits.
2. Notochord is absent.
3. Central nervous system is dorsal.
4. Heart is dorsal if present.
5. Post anal tail is absent.

Choose the most appropriate answer from the options given below:

Options

• B, D & E only

• B, C & D only

• A & Conly

• A, B & D only

Answer 1

B, D & E only

Explanation:

In chordates, the pharynx is punctured by gill slits; in non-chordates, gill slits are missing. Nonchordates lack the notochord. Non-chordates have a ventral central nervous system. In non-chordates, the heart is dorsal if it exists. Nonchordates do not have a post-anal tail.