Pearl oyster is a mollusc which belongs to class :
Cephalopoda
Pelecypoda
Scaphopoda
Gastropoda
B.
Pelecypoda
Pinctada is commonly called Indian pearl oyster. Oyster's shell secretes pearls, whenever any organism enters the shell and causes irritation. Pinctada belongs to Phylum-Mollusca and Class Pelecypoda.
Continuous bleeding from an injured part of body is due to deficiency of :
Vitamin A
Vitamin B
Vitamin K
Vitamin E
As per classification which of the following is correct ?
Ascaris, Pheretima, Grasshopper
Hydra, Pterido, Leucosolenia
Starfish, Grasshopper, Solen
Pila, Dentalium, Octopus
Hydrophytes are characterised by :
thick and large leaf
delicate and mucilagenous stem
short spinous stem
all of the above
In which of the following class of Annelida, one pair ovaries and several pair testes are found ?
Archiannelida
Hirudinea
Oligochaeta
Polychaeta