Notochord originates from

• Mesoderm

• Ectoderm

• Endoderm

• None of these

Which of the given option is correct regarding the statements?

Statement I: Cephalochordata bears notochord all along the body throughout life.

Statements II: Urochordate bears vertebral column only in the tail region throughout the life.

• I wrong, II correct

• I correct, II wrong

• Both I and II are wrong

• Both are correct

Which of the following cells in earthworm play a role similar to liver in vertebrates?

• Amoebocytes

• Mucocytes

• Chloragogen cells

• Epidermal cells

Match the following and select the correct option.

List I	List II
A. Cyclostomes	1. Hemichordata
B. Ayes	2. Urochordata
C. Tunicates	3. Agantha
D. Balanoglossus	4. Pisces
E. Osteichthyes	5. Tetrapod

• A	B	C	D	E
  3	5	2	1	4

• A	B	C	D	E
  3	1	5	2	4

• A	B	C	D	E
  1	2	3	4	5

• A	B	C	D	E
  2	3	4	1	5

115.

Chondrichthyes is characterised by

• Placoid scale

• Placoid scale and ventral mouth

• Ventral mouth

• Ctenoid scale and ventral mouth

Ichthyology is study of

• Aves

• Amphibians

• Reptiles

• Fishes

Select incorrect pair

• Porifera – Choanocytes

• Coelenterata – Nematocysts

• Annelida – Segmentation

• Monera – Eukaryote

Bilateral symmetry, metameric segmentation, coelom and open circulatory system are the features of

• Annelida

• Arthropoda

• Mollusca

• Echinodermata

Correctly matched set of phylum, class and example is

• Protozoa-Mastigophora-Entamoeba

• Mollusca=-Bivalvia-c-Pmcrcdc

• Arthropoda-Diplopoda-Scolopendra

• Chordata-Cyclostomata-Phrynosoma

The most primitive vertebrates are

• Ostracoderms

• Cephalochordates

• Placoderms

• Cyclostomes