Biology Le5
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Name 2 alternatives to using pestisides
Gm crops or Biological controll
What are pesticides ?
Pestcides are chemicals used to kill unwanted organisms
What substances are added to soil to improve nitrate levels?
Feratalisers
What type of crop could be used to reduce fertaliser use?
Gm crop
What is the first chain of event when fertaliser leaches into a loch
Fertalisers leach into fresh water adding extra un wanted nitrates
What is the second chain of event when fertaliser leaches into a loch
This increases algal populations which can cause algal bloom
What is the third chain of event when fertaliser leaches into a loch
Algal blooms reduce light levels and kill aquatic plants
What is the fourth chain of event when fertaliser leaches into a loch
Dead plants aswell as algae become food for bacteria
What is the final chain of event when fertaliser leaches into a loch
The bacteria uses up large quantitys of o2 avaliable for other organisms
Give one advantage of using pesticides
increase in crop yeald
Give one disadvantage of using pesticides
The decrease in bio diversty
Explain what is ment by bio accumulation.
Bio accumulation is the build up of pesticides in an animals body fat
Explain what is ment by bio magnification.
Bio magnification us when pesticides are passed along food chains and toxisity increases.