Question

Study of locomotion in fishes and role of different fins

Answer 1

Oscillatory. Oscillation is viewed as pectoral-fin-based swimming and is best known as mobuliform locomotion. The motion can be described as the production of less than half a wave on the fin, similar to a bird wing flapping. Pelagic stingrays, such as the manta, cownose, eagle and bat rays use oscillatory locomotion



Pitching force is countered by the pectoral fins which also function as elevators. ... Pelvic fins in cartilaginous fishes do not contribute to swimming or balancing. LOCOMOTION IN SKATES AND RAYS (HYPOTREMATA) Like other elasmobranchs, rays also have heterocercal tail fin and two dorsal fins on the tail.

Answer 2

Digestive Action of Gastric Secretion. Pepsin. The main digestive action of gastric juice is exerted by pepsin, which catalyzes the partial hydrolysis of proteins. Pepsin is secreted in the state of pepsinogen by glands in the stomach's body and fundus.