There are two types of root systems pictured above, fibrous and taproot. Roots absorb minerals from the soil. There are ten minerals needed for normal plant growth. Explain the difference between macronutrients and micronutrients. Chemical messengers that affect a plant's ability to respond to its environment.
Hormones are organic compounds that are effective at very low concentrations.
These chemicals are usually synthesized in one part of the plant and transported to another location. They interact with specific tissues to causes changes such as growth and fruit ripening. Because hormones stimulate or inhibit plant growth, they are referred to as growth regulators . Gibberellins - a group of hormones that primarily stimulate elongation growth. Ethylene - the hormone responsible for the ripening of fruit.