Food production - Unit 3

Question 1

What chemical does fertilisers provide plants and what do plants do with it

Answer 1

Nitrates, they build amino acids into proteins

Question 2

Algal blooms.

Answer 2

-Fertilisers leach into freshwater due to rainfall
-Increase the growth of algae in the water
-algae blocks most of the sunlight from reaching the water plants at the bottom of the body of water
-Plants die as they cannot produce their own food from photosynthesis
-They become food for bacteria
-Bacteria divides and take up most of the oxygen in the water
-decrease in biodiversity as the water animals have no oxygen and they die

Question 3

What are two alternatives to pesticides ?

Answer 3

-Biological control
-Genetically modified crops

Question 4

What are pesticides used for ?

Answer 4

Killing plants or animals which are affecting crop yield.

Question 5

Pesticides sprayed on crops can accumulate in the bodies of living organisms over time, reaching lethal levels. What is this called?

Answer 5

Bioaccumulation

Question 6

What is biological control ?

Answer 6

Using living things to control pests