Population And Food Products Flashcards
Advantages of polyethylene tunnel
1.prevent entry of pests
2.increase temperature
3.protect crops from effect of weather
Advantages of glass house
Protect crops from pests
Crops can be planted over year
Increase crop yield
How to increase carbon dioxide in glass House??
Burn paraffin wax
Steps of production of youghrt
1.equimpent used is sterillised
2.milk is pasteurised by heating
3.cool milk at 40 to 45 and add lactobacillius bacteria
4.samples taken to test whether yougurt ready for packaging
5.flavours and colours are added and pack yougurt
Why equipment use in making youghrt is sertillised?
To kill unwanted bacteria and prevent chemical contamination
Method to ensure high yeild of fish farm?
control water quality
Control diseases
Control waste products by cleaning nets
Use small amount of food
Use selective breeding
How to Control water quality ?
By filters
And and pumping oxygen in water
How to control iintra specific prediation
Separating large and small fish
How to control intrespecific prediaton
Using nets
Advantages of pesticides
Kill entrie population of pests
Cheap
Immediate effect
Disadvantage of pesticides
Non selective
Need reapplying
Devolp resistance
Bioaccilamtion
Advantages of biological control
No pollution
No bioacclumtion
Specific
No resistance
Disadvantages of biological control
Doesn’t kill entire pest population
Distrub food chain
Takes longer time to be affective
Benfits of phosphorus for plants
Synthesis of atom and enzymes
Benfits of potassium of for plants
Strengthen plant and increase resistance to dieseases
