Differentiate between:

$(a)$ Hypocotyl and epicotyl;

$(b)$ Coleoptile and coleorrhiza

$(c)$ Integument and testa;

$(d)$ Perisperm and pericarp.

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$(a)$

 Hypocotyl  Epicotyl
$1.$ The portion of the embryonal axis which lies below the cotyledon in a dicot embryo is known as the hypocotyl.  The portion of the embryonal cotyledon in a dicot embryo is known as the epicotyl. 
$2.$ It terminates with the radicle. It terminates with the plumule.

$(b)$

Coleoptile Coleoptile
 It is a conical protective sheath that encloses the plumule in a monocot seed. It is an undifferentiated sheath that encloses the radicle and the root cap in a monocot seed.  It is an undifferentiated sheath that encloses the radicle and the root cap in a monocot seed. 

$(c)$

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

$(d)$

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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