Unit 3-Food Production

Question 1

Why is there the need for the use of fertilisers and pesticides?

Answer 1

Increasing human population requires an increased food yield

Question 2

Nitrate rich substances used by farmers to grow crops

Answer 2

Fertilisers

Question 3

Why do plants need nitrates?

Answer 3

To produce amino acids which are synthesised into plant proteins

Question 4

Chemicals use by farmers to eradicate insects and weeds

Answer 4

Pesticides

Question 5

Process of fertilisers leaching into fresh water

Answer 5

Eutrophication

Question 6

Define the process of eutrophication

Answer 6

1. Fertilisers wash into rivers and lakes
2. Algal blooms grow and block out light
3. Plants in water die and eaten by bacteria
4. Bacteria use up available oxygen in water
5. Animals may die due to lack of oxygen

Question 7

Technique involving gene alteration to reduce fertilisers

Answer 7

Genetic modification

Question 8

Term given to pesticides accumulating in food chains, causing increased toxicity

Answer 8

Bioaccumulation