Flashcards in B4h- farming Deck (24)
What do pesticides do?
kill insects that eat crops
What are some examples of pesticides?
insecticides to kill insects
fungicides to kill fungi
herbicides to kill plants (weeds)
What are the disadvantages of using pesticides?
-may enter and accumulate in food chains
-pesticides may harm organisms which are not pests
-some pesticides are persistent
What is intensive farming?
trying to produce as much food as possible
How do herbicides reduce energy loss in a food chain?
they kill weeds so more of the suns energy goes to the crops, and not to any other competing plants
What are some examples of intensive farming methods?
What are hydroponics?
where plants are grown without soil but in nutrient solutions (water and fertilisers)
What are some uses of hydroponics?
growing glasshouse tomatoes
growing plants in areas with barren soil
What are the advantages of hydroponics?
mineral levels can be controlled more accurately
diseases can be controlled more effectively
What are the disadvantages of hydroponics?
lots of fertilisers need to be added
there's no soil to anchor the roots and support the plants
How does battery farming reduce energy loss in food chains?
Animals are kept close together indoors in small pens so they're warm and can't move about. This means energy isn't wasted moving around and keeping warm
What are the advantages of Intensive farming?
allows us to produce a lot of food from less land all year round at cheap prices
What are the disadvantages of Intensive farming?
-destroys natural habitat of wild creatures (removal of hedges)
-Pesticides disturb food chains
-cruel to animals (battery farms)
How do pesticides disturb food chains?
they can kill organisms that aren't pests which can cause a shortage of food for animals further up the food chain
What are organic farming methods?
methods that contain no artificial fertilisers and no pesticides
What do organic fertilisers do?
they recycle the nutrients left in plant and animal waste.
What is crop rotation?
growing a cycle of different crops in a field each year, stopping pests and diseases of one crop building up and stops nutrients running out
What is weeding?
physically removing the weeds
What is varying seed planting times?
sowing seeds later or earlier in the season avoiding the major pests
What are the advantages of Organic farming methods?
-uses fewer chemicals
-better for the environment, don't use pesticides
-farm has to follow guidelines on ethical treatment of animals
What are the disadvantages of organic farming methods?
-takes up more space
-more labour intensive
-cant grow as much food
What is biological control?
using living things instead of chemicals to control a pest
What are the advantages of biological control?
-no chemicals are used so there's less pollution, disruption of food chains and risk to people eating
-no need to keep repeating the treatment