Land pollution & decay

Why is more waste being sent to landfill sites?

• As global warming is increasing

• As biodiversity is decreasing

• As the human population is increasing

• As more sewage is being produced

Which gas, released by landfill sites, contributes to the greenhouse effect?

• Sulfur dioxide

• Nitrogen oxide

• Methane

• Oxygen

What is the minimum time it takes for a plastic bag to decompose?

• 5 years

• 50 years

• 500 years

• 5000 years

When toxic chemicals build up in food chains it is called:

• Eutrophication

• Bioaccumulation

• Decomposition

• Biodiversity

When toxic chemicals build up in food chains, why isn't the herbivore in the food chain usually affected by the toxin?

• The herbivore breaks it down

• The concentration isn't high enough to harm the herbivore

• The herbivore egests it

• The herbivore doesn't eat the plants containing the toxin anymore

An example of a toxin that builds up in food chains is:

• Nitrogen

• Methane

• DDT

• CFC's

Which conditions would speed up decay? Choose all that are correct:

• Warmth

• Less decomposers

• More decomposers

• Less oxygen

• More carbon dioxide

When the fats in milk are broken down, what are the products? Choose any that are correct:

• Glycerol

• Amino acids

• Glucose

• Fatty acids

• Starch

Why does the pH decrease when the decay of milk occurs?

• Amino acids decrease the pH

• Fatty acids decrease the pH

• Glucose decreases the pH

• Glycerol decreases the pH

If lipase is used to break down milk, why would digestion eventually stop if the temperature continues to increase past 60oC?

• The enzyme is used up

• All the milk has been digested

• The lipase has been denatured

• The substrate has been denatured