Q3 of 525 Page 237

Why are protozoa ale called early aninmals ?

Protozoa are regarded as early or primitive animals because they are microscopic with primitive mode of reproduction and they exhibit a cellular level of organisation.


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1

Give one example of each

(i) Asymmetry, radial symmetry and bilateral symmetry;


(ii) Acoelomate, pseudocoelomate and haemocoelomate.

 2

Why is Euglena is called plant-animal?

 4

Name the organisms which has (l) Setae and parapodia (ii) Tube feet.

 5

What is haemocoel? Which groups of anirnals have haemocoel ?