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Diversity In Living Organisms
List the salient features of Phylum Porifera of Animal Kingdom?
(1) Phylum Porifera
Main Features:
i. They have pores all over their body.
ii. The are non motile and attached to some solid support.
iii. Animals of this phylum are known as sponges. They have a characteristic canal system for water passage not found in any other kind of animals.
iv. Their skeleton is made up of calcareous or siliceous spicules or spongin fibres.
v Reproduction is both asexual by budding and gemules and sexual reproduction through fertilization.
vi. Body has very minimum differentiation and division into tissues.
Examples. Sycon, Spongilla and Euplectella.
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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?
Which do you think is a more basic
characteristic for classifying
organisms?
(a) the place where they live.
(b) the kind of cells they are
made of. Why?
What is the primary characteristic on which the first division of organism is made?
On what basis are plants and animals put into different categories?
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