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Description
Flashcards by Lee Jun Wei, updated more than 1 year ago
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Created by Lee Jun Wei
about 8 years ago
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| Question | Answer |
| How to test for pH? | Litmus paper: Acidic=blue-red Alkaline=red-blue Universal indicator: Acidic=red Alkaline=blue/green Neutral=green Data logger Acidic= < 7 Alkaline= >7 Neutral= 7 |
| Why do people use Slash-and-Burn? | * A method to clear the land. + It is a cheap and easy method. - Cause haze and air pollution. - Eye irritation and breathing problem. - Forest fires. - Soil erosion. - Loss of natural habitats -> leads to extiction of wildlife. |
| What are the different types of protection of crops? | Chemical control and Biological control. |
| How to improve food production? | 1) Plant hormones. (Improve growth ripening of fruits) 2) Improve plant and animals varieties. 3) Intensive production methods. (Milking farm/Fish farm tanks) 4) High-tech methods.(Vertical farming/Hydroponics/Areoponics) |
| What are the effects of chemical controls? | 1) Soil contamination 2) Water contamination 3) Chemicals enter the food chain causing the food chain to be interrupted and contaminated. |
| What is the good use of Biological controls?(Advantages) | 1) No chemicals are used, hence there is no contamination of the soil and water. 2) Crops are also not contaminated by chemicals. |
| What does Pesticides and Herbicides do? | Pesticides kills pests. Herbicides kills weeds. |
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