UNIT THREE; Food production

Question 1

What are Fertilisers?

Answer 1

Fertilisers are chemicals added to the soil to improve plant growth.

Question 2

What Elements are needed for fertilisers to help make plants their optimum

Answer 2

Nitrogen- proteins
Phosphorus
Potassium.

Question 3

What are the stages of eutrophication.

Answer 3

1. Fertilisers from the soil in fields leach into rivers
2. Algae grows uncontrollable in the water
3. An algae bloom covers the river and stops light getting to other plants
4. Bacteria feeds on the dead plants and Algae
5. Bacteria increases and uses up the rivers oxygen.
6. Animals Die

Question 4

Why do animals die due to eutrophication?

Answer 4

The water animals like fish don’t have enough oxygen due to the algae cover and bacteria so die
The land animals like foxes cant get to the water due to the Algae cover so die of thirst
If they do drink the water with the algae they will get ill and die.

Question 4

What leads up to eutrophication?

Answer 4

Population growth increases sewage, industrial waste, oil, pesticides and fertilisers and nitrates and phosphates cause it.