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Differentiate between 
Oviparity and viviparity


Oviparity Viviparity
1. The animals lay eggs and young ones hatch from them. 1. Animals give birth to young ones. 
2. Found in reptiles and birds 2. Found in Mammals
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Differentiate between 
Polyp and Medusa


Polyp Medusa
Sessile and cylindrical Motile, free-living and
umbrella shaped
e.g Hydra e.g Aurelia
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Differentiate between :
Acoelomate and Pseudocoelomate


Acoelomate Psedocoelomate
1. The body cavity is absent  The mesoderm present is scattered in pouches and the cavity present is considered to be false. 
Found in  Platyhelminthes Found in Aschelminthes
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Differentiate between
Direct and Indirect development


Direct Development Indirect Development
The youngs ones are completely different from their adult forms.   The young ones resemble their adult form. 
Occurs in cockroach and frog Occurs in birds, reptiles and mammals
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Differentiate between 
Open and Closed circulatory system


Open Circulatory system Closed circulatory system
1. The blood flows in spaces called sinuses and cells and tissues are bathed in blood.  1. The blood flows through a network of blood vessels
2. Inefficient 2. Efficient
3. Found in Arthropoda and Mollusca 3. Found in Annelida and mammals.
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