Question

Differentiate between:

1. Hypocotyl and epicotyl;
2. Coleoptile and coleorrhiza;
3. Integument and testa;
4. Perisperm and pericarp

Answer 1

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.

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(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.

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(c)

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

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(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