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Environmental weeds multiple choice

1. Environmental weeds are:
   1. weeds that are good for the environment
   2. plants that invade areas of natural ecosystems
   3. weeds that grow where you don't want them
   4. are all annual plants
      
      
2. Environmental weeds are often spread by:
   1. animals
   2. machinery
   3. wind and water
   4. all of the above
      
      
3. An example of a mechanical method of controlling environmental weeds is:
   1. spraying
   2. using a living organism
   3. digging out the weeds
   4. grazing
      
      
4. Which of the following is an example of controlling weeds using a biological control?
   1. introducing an aphid to control nodding thistle
   2. ripping a pasture to control Pattersons Curse
   3. spraying glyphosate on the lawn to kill weeds
   4. sowing pasture species that will compete with the weeds
      
      
5. An example of using an environmental control to manage weeds is:
   1. digging weeds out by hand
   2. spraying weeds using a chemical with low toxicity
   3. shading out weeds with other plants so they cannot grow
   4. introducing a parasite to eat the weed

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