Differentiate between:

$(a)$ Integument and testa;

$(b)$ Perisperm and pericarp.

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$(a)$

Integument  Testa 
It is the outermost covering of an ovule. It provides protection to it.  It is the outermost covering of a seed. 

$(b)$

Perisperm  Pericarp 
It is the residual nucellus which persists. It is present in some seeds such as beet and black pepper.  It is the ripened wall of a fruit, which develops from the wall of an ovary.  

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