Although you may be aware of the fact that plants use their roots to absorb essential nutrients like nitrogen, you may not know the exact reason behind their need to gain nitrogen. So, let us start by telling you that nitrogen is a macro-nutrient that is highly important for the healthy growth of plants. If plants do not receive this component, then they may also show signs of nutritional deficiency as human beings do.
roots
Why do plant roots grow down and not up?
Next time when you go to nearby park for a walk, closely observe the plants. You will find that all kind of plants, from grass to huge trees, grow their stems and leaves up but their roots below the ground.