How minerals and water are taken up by a plant?

Plants absorb water and minerals through roots. The roots have a minute cells xylem and phloem. The phloem cells take food materials to all parts of plants. And the xylem cells take water to all parts. The cells act as capillaries just like straws that we use to drink juices.

What is grass good for?

In our ecosystem grass is useful in many ways.
It provides fodder for cow, horses, and other animals.
It provides shelter for insects and food for worms.
Bamboo is also a type of grass family. It provides wood for construction and making furniture.
Rice, wheat also belongs to grass family, which is the staple food for Asian countries like India.