BIO 251A Lecture Notes - Lecture 1: Autotroph, Gamete, Osmoregulation
Document Summary
If something does not carry out all of these life processes, it is either dead or non-living: viruses are a good example of non-living particles/agents. Nutrition: organisms must obtain food to provide energy, energy is necessary to carry out life processes e. g. movement, respiration and excretion. Nutrition in plants: plants use sunlight, carbon dioxide and water to produce oxygen and glucose in the process of photosynthesis, because plants create their own food for energy, they are described as being autotrophic. Excretion in animals: waste products excreted by animals include, carbon dioxide from respiration, water from respiration and other chemical reactions, urea which contains nitrogen resulting from the breakdown of proteins. Response to surroundings: the sensitivity of an organism refers to its ability to detect and respond to stimuli in its surroundings, responding to the environment around them gives an organism the best chances of survival.
