1. Most organisms are active in a limited temperature range.

a) identify the role of enzymes in metabolism, describe their chemical composition and use a simple model to describe their specificity on substrates

b) identify the pH as a way of describing the acidity of a substance

c) explain why the maintenance of a constant internal environment is important for optimal metabolic efficiency

d) describe homeostasis as the process by which organisms maintain a relatively stable internal environment

e) explain that homeostasis consists of two stages:

– detecting changes from the stable state

counteracting changes from the stable state

f) outline the role of the nervous system in detecting and responding to environmental changes

g) identify the broad range of temperatures over which life is found compared with the narrow limits for individual species

h) compare responses of named Australian ectothermic and endothermic organisms to changes in the ambient temperature and explain how these responses assist temperature regulation.

i) identify some responses of plants to temperature change