BIOL 1002 Chapter : Chapter 45 Plant Responses To The Environment- Very Organized
Document Summary
How plants respond to the environment chapter 45. Plants sense and respond to different stimuli in their environment through the action of chemicals called plant hormones or growth regulators. The bending of plants towards sunlight, phototropism: discovery of plant hormones: the darwins. The tip transmits info about direction of light further down to bending region of stem (fig e45-2, 3) How does the plant bend: one side gets longer than the other, peter boyson-jensen discovered that the signal that causes the bending is a chemical. E45-4: produced in the tip and moves down the shoot causing cell elongation. Frit went isolated that chemical compound and called it auxin to increase : he then took agar that collected the auxin and placed it on stumps to see the effects: Hormones are chemicals produced in one area of the body and transported to other regions where they exert specific effects. This definition can be applied to all organisms, plants and animals.
