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
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
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