Leaves originate from . . . . . . and are arranged in an . . . . . . order.

Identify the plant whose leaf is shown in the image.

In walnut,stomata are found on

In $Acacia$ species,the first few leaves are pinnately compound. Then there are leaves with flattened petiole and fewer pinnae. The leaves of the adult plant have parallel-veined flattened petioles and no pinnae. It shows that:

Interpetiolar stipules occur in

Leaves become modified into spines in