AP BIOLOGY

Detailed explanation-1: -Phosphorus (P) and potassium (K) are the two main nutrients that stimulate root growth. Organic fertilisers often display the relative quantities of each, as well as nitrogen (N), in the form of the NPK ratio. In particular, phosphorus allows new root systems to spread through the soil or another growing medium.

Detailed explanation-2: -The roots of a plant take up water and nutrients from the soil. They also anchor the plant to the ground and keep it steady. The stem carries water and nutrients to different parts of the plant. It also provides support and keeps the plant standing upright.

Detailed explanation-3: -Taproots and fibrous roots are the two main types of root systems. In a taproot system, a main root grows vertically downward with a few lateral roots. Fibrous root systems arise at the base of the stem, where a cluster of roots forms a dense network that is shallower than a taproot.

Detailed explanation-4: -Roots absorb water and nutrients from the soil. They anchor the plant firmly. They help in storing food and nutrients. Roots transport water and minerals to the plant.