Genetic Resistance. Can be developed within 5-10 years by insects (much sooner in tropical areas). It is a developed immunity to pesticides that, through natural selection, can make the insects come back stronger. Weeds and plant disease organisms also develop this, but much more slowly. Tolerance Level
greenhouse definition: The definition of a greenhouse is a building made of glass panes in which heat and humidity can be regulated in order to grow plants. (noun) An example of a greenhouse is where vegetables can be grown when the outside weather is bel...
One entry found for greenhouse effect. Main Entry: greenhouse effect. Function: noun. : the warming of the earth's atmosphere that occurs when the sun's radiation passes through the atmosphere, is absorbed by the earth, and is given off as radiation of longer wavelength which can be absorbed by atmospheric gases (as carbon dioxide and water vapor) Pronunciation Symbols.