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...
greenhouse effect. n. A phenomenon in which the atmosphere of a planet traps radiation emitted by its sun, caused by gases such as carbon dioxide, water vapor, and methane that allow incoming sunlight to pass through but retain heat radiated back from the planet's surface.reenhouse effect. 1. The term given to the heating of the Earthâs surface caused by infrared radiation trapped in the atmosphere. 2.