LE6 Notes Flashcards
(15 cards)
The worlds human population is increasing. Increase in human population requires an…
increase in food yield
Increased food yields is partly brought about by the use of
pesticides and fertilisers
a _____ is a destructive insect or animal that attacks crops and livestock
pest
a pest is…
a pest is a destructive insect or animal that attacks crops and livestock
what is a pesticide
a pesticide is a chemical used to kill unwanted organisms
plants and animals reduced by crop yield can be killed by
pesticides
pesticides kill a wide range of non-pest species and can reduce
biodiversity
bioaccumulation
pesticides sprayed onto crops can accumulate in the bodies
pesticides sprayed onto crops can accumulate in the bodies
bioaccumulation
as pesticides are passed along food chains, toxicity ________
increases
biomagnifictaion
pesticides are passed along food chains, toxicity increases and can reach lethal levels.
genetically modified (GM) crops
plants used in agriculture, the DNA of which has been modified using genetic engineering methods
fertilisers can be added to the soil to
increase the nitrate levels of the soil
fertilisers provide chemicals such as nitrates which _________________
increase crop yield
nitrates dissolved in soil water are absorbed _____
into plants
