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Question 13

Differentiate between:
(a) Hypocotyl and epicotyl
(b) Coleoptile and coleorrhiza
(c) Integument and testa
(d) Perisperm and pericarp

Answer

Differentiate between

(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 axis which lies above the cotyledon in a dicot embryo is known as the epicotyl.

2.

It terminates with the radicle.

It terminates with the plumule.

(b)

Coleoptile

Coleorrhiza

 

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.

     

(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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