Parts of a plant and their functions

During a school gardening project, Priya noticed that the roots of a bean plant grew deep into the soil. What is the main function of the roots?

During a school gardening project, Ravi noticed that the roots of a plant grew downwards into the soil while the stem grew upwards towards the light. Which part of the plant is responsible for absorbing water and minerals from the soil?

During a school gardening project, Ravi noticed that the roots of his bean plant grew deeply into the soil. He watered the plant with 200 ml of water every day. After one week, he measured the water left in the soil and found only 50 ml. Which part of the plant is mainly responsible for absorbing most of the missing 150 ml of water?