Identify the animal group having:

(a) Body spiny and radial symmetry.

(b) Bones light and hollow.

(c) Soft-bodied animals supported by calcareous shells.

(d) Four pairs of jointed legs, head and thorax fused.

To which phylum do earthworm and leech belong?

Give two peculiar characters of sponges.

Name the group of plants that belongs to the division Thallophyta.

(a) Write one main characteristic feature that differentiates Gymnosperms from Angiosperms.

(b) Give one example each of Gymnosperm and Angiosperm.