In contrast to annelids the platyhelminthes show

• radial symmetry

• presence of pseudocoel

• bilateral symmetry

• absence of body cavity

162.

Mantle, foot and shell are the characteristics of

• Nautilus

• Echinus

• Limulus

• Euplectella

Third cleavage of frog's development is

• equatorial

• vertical

• latitudinal

• none of these

The main excretory organ of prawn is

• green gland

• flame cell

• Malphigian tubule

• nephridia

Which of the following is not an insect?

• Locust

• Lepisma

• Termites

• Spider

Which cells are found only in sponges?

• Amoeboid cells

• Choanocytes

• Pigment cells

• Gland cells

Which of the following assists in the locomotion of the organism stated

• Epithelium of' Pheretima

• Trichocysts of Paramecium

• Pedicellaria of Star fish

• Posterior sucker of Hirudinaria 

The scientist, who described the birds as glorified reptiles, was

• Romer

• Huxley

•  Mendel

• Robert Hooke

In frog, the vertebra with an anterior convex surface (i.e., double convexties) is

• atlas

• urostyle

• 8th vertebra

• 9th vertebra

What is left when bath sponges dries up

• Spicules

• Spongin fibres

• Tentacles

• Holdfast