In the case of Poriferans, the spongocoel is lined with flagellated cells called:
1. Oscula
2. Choanocytes
3. Mesenchymal cells
4. Ostia
Which of the following characteristic features always hold true for the corresponding group of animals?
(a) | Viviparous | (1) | Mammalia |
(b) | Possess a mouth with an upper and a lower jaw | (2) | Chordata |
(c) | 3- chambered heart with one incompletely divided ventricle | (3) | Reptilia |
(d) | Cartilaginous - Endoskeleton | (4) | Chondrichthyes |
1. a
2. b
3. c
4. d
Choose the correct statement.
1. | All mammals are viviparous |
2. | All cyclostomes do not possess jaws and paired fins |
3. | All reptiles have a three-chambered heart |
4. | All Pisces have gills covered by an operculum |
Which among these is the correct combination of aquatic mammals?
1. Dolphin, Seals, Trygon
2. Whales, Dolphin, Seals
3. Trygon, Whales, Seals
4. Seals, Dolphin, Sharks