Question

mention a plant whose seeds and leaves or any other two parts are useful to us

Answer 1

leaves and fruits of drumstick plant
banana leaves and fruit itself

Answer 2

Wheat seeds are useful to us because they are processed into wheat flour which is consumed an is rich in nutrients. The flour can be used to make a variety of meals.

The leaves and stalk of wheat can be used as food for livestock. It is also used in thatching houses