|Better Farming Series 02 - The Plant: the Stem; the Buds; the Leaves (FAO - INADES, 1976, 30 p.)|
|Plan of work|
|Where is the stem?|
|How a stem is made|
|What the stem does|
|How a leaf is made|
|The shape of leaves|
|What are leaves for?|
|How the leaf changes raw sap into elaborated sap|
|Organic matter in the plant|
|The plant breathes.|
|The plant transpires.|
|Some practical applications|
|The plant needs air and light|
|The plant needs water|
|The plant needs its leaves|
Pick up some leaves of a mango tree or coffee tree. Let us look at them.
· Leaves are usually of a green
colour, more or less dark.
· They are joined to the stem by a stalk called the leaf- stalk.
· The leaf-stalk is continued into the leaf by the midrib.
· Other smaller veins branch out from the midrib. These are the primary and secondary veins.
· The whole flat part of the leaf is called the leaf blade or lamina.