Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
Chemicals and the environment
Member rating: No Rating | Words: | Submitted: Fri Aug 29 2003
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
CHEMICALS AND THE ENVIRONMENT Pesticides A pesticide is any substance or mixture of substances for preventing, destroying, repelling or mitigating any pest. www.epa.gov.html (office of pesticide programs) Pesticides can be used to control the numbers of pests which affect or reduce crop yields. They work by eliminating the organism or substance responsible for reducing crop yields as stated below. Pesticides are toxic substances deliberately added to our environment. They are used because they are toxic and biocidal- to kill and harm living things. www.pesticides/about.html In many ways crop plants are no different from plants growing under more natural conditions. They compete with other species for light, water and minerals. Insects feed on their leaves and die by being infected with viruses or fungi on the plant. This all reduces the overall growth of the plant and will most likely affect the number of seeds it produces which in turn reduces the yield of...
To see the full version of this document, and 145,348 others
