BIOL 1902 Lecture Notes - Lecture 7: Arteriole, Meadow Vole, Nectar
7 Apr 2016
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A plant almost never has just one type of defence. When a plant is under attack an alarm is sent to other parts to prepare themselves: these are called phytohormones. Some plants hire body guards as a defence (carpenter ants) and give pollen to them. Extrafloral nectaries provide food and draw the ants in who protect the plants. We have a lot of water in our bodies. Staying warm is a big problem to animals. Mammals can control their body temperatures: endotherms: warm blooded, ex. Mammals grow more hair in preparation for winter: two types of hair. Guard hair: outer part of an animals coat. In the winter they grow longer and thicker. Underfur: next to the skin and under the guard hair and. Birds grow more feathers and bulkier feathers traps the body heat: two types: Animals also add extra layers on the inside: mammals have two types of fat.
