Q47 of 525 Page 259

Write short note on protochordates.

Protochordates:

(i) Notochord persists throughout the life, no vertebral column.

(ii) These animals are bilaterally symmetrical, triploblastic and have a coelom.

(iii) Protochordates are marine animals.

(iv) Examples are Balanoglossus, Herdemania and Amphioxus.

Describe some flight adapiations of the birds.

Write down four main characters of chordates.

Give an example each of Urochordata and Cephalochordata.

Give one point of difference between notochord and nerve cord.