Structure of leaf which provides channels of transport for water,minerals,and food materials is called:

Unicostate venation is also known as:

The leaf parts get modified into spines in order to

Assertion : $A$ simple leaf has undivided lamina.
Reason : Leaves showing pinnate and palmate venation have various types of incisions.

When the apex is pointed,hard and sharp like a spine as in Date Palm,it is called

Identify the order of plants showing alternate,opposite,and whorled phyllotaxy.