Sources of Food
What is the gas used by plants for photosynthesis?
carbon dioxide
Describe the taste of acids.
sour
Bacteria and fungus are examples of ___________.
microbes / microorganisms
Describe one benefit of using the slash and burn method to clear forests for farming.
Describe what will be observed if blue litmus paper was tested on alkalis.
the litmus paper remains blue
How does lowering the temperature help prevent food from spoiling.
microbes cannot grow / become inactive
Name two problems caused by haze.
Poor visibility / breathing problems / increased temperature / eye irritation
What gas is produced when metal is reacted with acids.
hydrogen gas
Name two preservation techniques that involve high heat.
pasteurisation / sterilisation / canning
Describe an alternative method of using pesticides to remove pests.
biological control / using the natural predator of pests to remove pest
A process where a new product is formed.
How does pickling help prevent food spoilage?
Lowers the pH / more acidic so that microbes cant grow.
Describe two functions of plant hormones.
ripening of fruits and weed killers
How do you test for carbon dioxide gas.
Limewater will turn white / chalky / milky / cloudy.
Describe two reasons for using food additives?
change texture / improve appearance / improve taste / preserve food / improve nutritional value