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Diversity In Living Organisms
List the features of Phylum Echinodermata.
Phylum Echinodermata (spiny skinned animals)
Main Features are as follows:
(i) They are marine and free living.
(ii) They are triploblastic, and have a coelomic cavity.
(iii) Body surface is covered all over by spines
(iv) Body cavity is modified into a water-vascular system and has a peculiar water-driven tube system which is connected tubefeet for locomotion.
(v) Sexes are separate.
(vi) They have hard calcareous structures that is used as a skeleton.
Examples. Asterias (star fish), Echinus (sea urchin), Antedon (feather star) etc.
A Antedon
B. Holothuria
C. Starfish
D. Ophioderma
E. Echinus
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Explain how animals in vertebrata are classified into further subgroups.
Name the biggest animal and the tallest tree.
What is classification?
Name the branch of science which deals with classification.
Why do we classify organisms?
Give three examples of the range of variations that you see in life form around you.
What was the basis of animal classification done by Aristotle.
Why a method of classification of animals proposed by Aristotle was not accepted ? Explain with example.
What do you mean by ‘characteristics’? Explain with example.
How hierarchy of classification be built?
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