Soil is a mixture of

Select the correct statements regarding the role of soil:
$(I)$ Soil is a reservoir of essential elements.
$(II)$ Soil not only supplies minerals but also harbours nitrogen-fixing bacteria.
$(III)$ Soil acts as a matrix.
$(IV)$ Soil holds water and supplies air to the roots.

Which type of soil is best for plant growth?

Which one is the main source of minerals essential for man and other organisms?

Describe soil as a reservoir of essential elements.

State the utilities of the land.