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IncreasingCropYields

Biology Edexcel IGCSE

QuestionAnswer
Benefits of growing crops in glasshouses/polytunnels Keeps plants free from pests/disease Allows farmers to control water supply to plants
Benefit of supplying artificial light to plants Allows them to photosynthesise more
How the plants can be kept warm By using heaters/glasshouse
Benefit of increased CO2 in glasshouse Increased rate of photosynthesis
How to increase CO2 levels in a glasshouse Use a paraffin heater
Three main minerals in fertiliser Nitrogen, phosphorus, potassium
Why would minerals be missing from soil? Used up by previous crop
How to make soil more fertile Use fertiliser
Disadvantage of using too much fertiliser Eutrophication
Pests Organisms that feed on crops
Two sorts of pest control Pesticides Biological control
Disadvantage of pesticides Bioaccumulation
Three sorts of biological control Predators Parasites Pathogens
Why is biological control better than pesticides? Longer-lasting Less harmful to wildlife No risk of bioaccumulation
Example of biological control using predators Ladybirds introduced to eat aphids
Example of biological control using parasites Flies introduced to lay eggs on slugs
Example of biological control using pathogens Bacteria that affect caterpillars
Disadvantage of biological control The predator can become a pest
Example of where biological control has caused a new pest to be introduced Cane toads in Australia
Created by: HJB2810
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