What is the importance of pneumatic bones and air sacs in Aves?
Pneumatic bones are hollow and hence are light weight. They help to reduce the weight and hence help the birds in flight. They also provide support.
What is the role of radula in molluscs?
Name the animal, which exhibits the phenomenon of bioluminescence. Mention the phylum to which it belongs.
Give one example each of an animal possessing placoid scales and that with cycloid scales.
Which group of chordates possess sucking and circular mouth without jaws?
