Bulliform or motor cells are present in

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:

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

Petiole is modified into tendril in

Select the correct pair regarding phyllotaxy:

$A$ mature angiosperm that bears only one leaf is