Chondrichthyes is characterised by
Placoid scale
Placoid scale and ventral mouth
Ventral mouth
Ctenoid scale and ventral mouth
B.
Placoid scale and ventral mouth
Chodrichthyes (cartilaginous fishes) are marine. Their mouth is ventral and they have cartilaginous endoskeleton. Dermal placoid scales are present, e.g. Scoliodon, Pristis, etc.
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 |
Bilateral symmetry, metameric segmentation, coelom and open circulatory system are the features of
Annelida
Arthropoda
Mollusca
Echinodermata
Branch of zoology dealing with the study of fishes is called
Arthrology
Ichthyology
Saurology
Herpetology
Select incorrect pair
Porifera – Choanocytes
Coelenterata – Nematocysts
Annelida – Segmentation
Monera – Eukaryote
Correctly matched set of phylum, class and example is
Protozoa-Mastigophora-Entamoeba
Mollusca=-Bivalvia-c-Pmcrcdc
Arthropoda-Diplopoda-Scolopendra
Chordata-Cyclostomata-Phrynosoma
Which of the following cells in earthworm play a role similar to liver in vertebrates?
Amoebocytes
Mucocytes
Chloragogen cells
Epidermal cells