Q49 of 525 Page 259

Give one point of difference between notochord and nerve cord.

difference between notochord and nerve cord are:

Notochord	Nerve cord
It is the part of skeletal system.	It is the part of nervous tissue
It lies lengthwise between the central nervous system and the alimentary canal.	It is a strand of nerve tissue forming the part of central nervous system.

Write short note on protochordates.

Give an example each of Urochordata and Cephalochordata.

Describe the characteristics used in hierarchial classification of organisms.

Briefly describe the importance of classification.