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.
In which of the following haemocyanin pigment is found?
Lower invertebrates
Echinodermata
Insecta
Annelida
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 |
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
