Connecting link between annelids and molluscs is

• Neopilina

• Peripatus

• Periplaneta

• Limulus

152.

Shell of molluscs is derived from

• foot

• mantle

• ctenidia

• placoid

chloragogen cells help in 

• respiration

• reproduction

• circulation

• nutrition

'Sea fan' belongs to

• Coelenterata

• Porifera

• Echinodermata

• Mollusca

Trochophore is the larva of

• Neopilina

• Chiton

• Pila

• All of these

Food storage in Leucosolenia occur by

• ostia

• osculum

• thesocyte

• spongocoel

Chloragogen cells of earthworms are analogous to vertebrate

• lungs

• liver

• gut

• kidneys

Class Crustacea differs from lnsecta in having

• two pairs of antennae

• jointed foot

• chitinous cuticle

• none of the above

Which of the following character is present essentialy in chordates 

• Ventral spinal chord

• Dorsal heart

•  Pharyngeal gill slits

• Blood flow in forward direction in ventral blood vessels

Number of cranial nerves in frog

• 10 pairs 

•  9 pairs 

• 12 pairs 

• none of these