Question

Write four important features that all chordatas posses?

Answer 1

The main characteristics of Chordates are :

1. Presence of a notochord, a rod like structure

present in the mid dorsal axis of the body.

Except in few primitive forms in which the

notochord persists throughout life, in all others

it is replaced by a backbone or vertebral

column.

All vertebrates including man, have a

notochord in embryonic life.

2. Presence of dorsal hollow nervous system.

3. Presence of tail in most chordates.

4. Presence of two pairs of limbs.

5. Blood is red due to the presence of

haemoglobin in erythrocytes (RBCs).

6. Reproduction takes place by sexual method.

7. Vertebral column forms the main axis of their

internal skeleton, which may be of bones or

cartilages

Answer 2

@Presence of notochord 

@ post anal tail 

@  hollow dorsal nerve node 

@ pharyngeal slits