Question 13
Differentiate between:
(a) Hypocotyl and epicotyl
(b) Coleoptile and coleorrhiza
(c) Integument and testa
(d) Perisperm and pericarp
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. |
