Correct Answer :
D. All of the above
Root system generally grows beneath the ground into the soil. Functions of root system are as follows: It provides great anchorage and support to the plant. Huge trees such as mango, red wood stand erect due to the root. The root hairs absorb nutrients, water and oxygen from the soil and conduct them to the upper parts of the plant. Some of the tap roots are specially modified for storage of carbohydrates and water.