In the case of Poriferans, the spongocoel is lined with flagellated cells called:
1. Oscula
2. Choanocytes
3. Mesenchymal cells
4. Ostia
| 1. | Metameric segmentation |
| 2. | Parapodia |
| 3. | Jointed appendages |
| 4. | Chitinous exoskeleton |
A jawless fish, which lays eggs in freshwater and whose ammocoetes larvae after metamorphosis return to the ocean is?
1. Eptratretus
2. Myxine
3. Neomyxine
4. Petromyzon
Metagenesis refers to?
| 1. | The presence of different morphic forms |
| 2. | Alternation of generation between asexual and sexual phases of an organism |
| 3. | Occurrence of a drastic change in the form during post-embryonic development |
| 4. | Presence of a segmented body and parthenogenic mode of reproduction |
Planaria possess a high capacity of:
1. metamorphosis
2. regeneration
3. alternation of generation
4. bioluminescence
A marine cartilaginous fish that can produce electric current is:
| 1. | Pristis | 2. | Torpedo |
| 3. | Trygon | 4. | Scoliodon |