Which of the following animals exhibit all these characters – bilateral symmetry, triploblastic, segmented and eucoelomate?

1.  Echinoderms

2.  Roundworms

3.  Molluscs

4.  Annelids

What is incorrect regarding cyclostomes?

Which of the following is not true about Porifera

1.Cellular level of organisation

2.Radial symmetry

3.Tissue is absent

4.Canal system is present

The central cavity of the sponges is known as

1.spongocoel

2.Ostia

3.Osculum

4.Gastro-vascular cavity

The minute pores in the  body wall of the sponges is known as

1.spongocoel

2.Ostia

3.Osculum

4.Spicules

Water canal is lined by

1.Spongin fibres

2.Choanocytes

3.Collar cells

4.Both 2 and 3

Canal system in sponges helps in

1.Food gathering

2.Respiratory exchange

3.Removal of waste

4.All of the above

In sponges, digestion is

1.Intercellular

2.Intracellular

3.Both inter and inter cellular

4.Gastric cavity

The mode of reproduction in sponges is

1.Sexual

2.Asexual

3.Both 1 and 2

4.None of these

Which of the following is true about sponges except

1.Sponges are hermaphrodite

2.Fertilisation is internal

3.Development is direct

4.Primitive multicellular animals