Molecular Biology is the branch of biology that deals with the structure and function of the macromolecules (e.g. proteins and nucleic acids) essential to life.
Plant ecology is a subdiscipline of ecology which studies the distribution and abundance of plants, the effects of environmental factors upon the abundance of plants, and the interactions among and between plants and other organisms.
Plant Systematics involves the study of Plants and their evolution. It deals with the Description, Identification, Nomenclature and Classification of Plants.
