Pupa 



The stage in the Metamorphosis of an insect between the 

 larval and adult stages. 



Pupation 



The process during the Metamorphosis of an animal 

 when the Pupa is formed. 



Pure Line 



A series of generations of individuals which orginated in 

 a Homozygous ancestor. 



Puszta 



A grassland type of vegetation in the Plains of Hungary, 

 cf. Steppe, Prairie. 



Pyramid of Numbers 



The concept of C. Elton that in most Food-chains the 

 number of individuals decreases in each succeeding stage, 

 large numbers of animals occur at the base, a few large ones 

 at the top. 



Pyrheliometer 



An instrument for measuring solar radiation. 



Pyrrhic 



Refers to fire. 



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