Eutrophication

Question 1

Step 1 of Eutrophication

Answer 1

Rain causes fertilisers to leach into the river/lake

Question 2

Step 2 of Eutrophication

Answer 2

The algae use the nutrients in the fertilisers to grow which causes an algae bloom

Question 3

Step 3 of Eutrophication

Answer 3

This bloom blocks the light to the plants underneath which die as they can’t photosynthesize

Question 4

Step 4 of Eutrophication

Answer 4

Bacteria decompose the dead plants

Question 5

Step 5 of Eutrophication

Answer 5

The number of bacteria increase and respire more using oxygen

Question 6

Step 6 of Eutrophication

Answer 6

Fish die due to lack of oxygen as they can’t respire aerobically