Differentiate between:
$(a)$ Hypocotyl and epicotyl;
$(b)$ Coleoptile and coleorrhiza
$(c)$ Integument and testa;
$(d)$ Perisperm and pericarp.
$(a)$
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. |
In angiosperms, the oospore on development produces
Scutellum is
The cylindrical portion below the level of cotyledons on embryonal axis is
In a cereal grain the single cotyledon of embryo is represented by