Download Elementary Plant Biology By James Edward Peabody and Arthur Ellsworth Hunt PDF book free online – From Elementary Plant Biology By James Edward Peabody and Arthur Ellsworth Hunt PDF: One class embraces the functions relating to the life of the individual organism. These functions have to do with the processes of eating, digesting, assimilating, taking in of oxygen, producing of energy, and excreting of waste matters.
These may be called the nutritive functions, if the term is used in its broadest sense. To the second group of activities belong the functions that have to do with the perpetuation of the animal or plant species, and these are known as the reproductive functions. Living organisms, whether plant, animal, or human, may, in the third place, be considered in their relations to one another and especially to the general welfare of mankind. Thus we may discuss the beneficial or injurious effects, so far as man is concerned, of different kinds of insects or of various types of bacteria; we may learn of the activities of individual men or of groups of individuals which promote or retard the advance of human society; or we might, if we were to carry the study still farther, even seek to learn the ways by which the higher thoughts of mankind, as expressed in poetry, music, and religion, affect the development of the human race.
Author(s): James Edward Peabody and Arthur Ellsworth Hunt