Q8 of 525 Page 237

Identify animal groups having
(a) Soft bodied animals supported by calcareous shells;

(b) Spiny body has radial body symmetry;

(c) Bones light and hollow;

(d) Four pairs of jointed legs and no wings;

(e) Extemal ear or pinna.

(a) Mollusca; (b) Echinoderrnata; (c) Aves; (d) Arachnida; (e) Mammalia.

Give one point of difference between Gymnosperms and Angiosperms.

Define phylogeny.

Give one example of hemichordata, urochordata and cephalochordata.

Give one point of difference between notochord and nerve cord.

Identify animal groups having(a) Soft bodied animals supported by calcareous shells;(b) Spiny body has radial body symmetry;(c) Bones light and hollow;(d) Four pairs of jointed legs and no wings;(e) Extemal ear or pinna.