Pollution

Question 0

Why would more people mean more CO2?

Answer 0

More people would mean more transport, and more transport means more CO2 emissions from burning fuels

Question 1

What is an indicator species (give examples too)?

Answer 1

An indicator species is sensitive to pollution - blood worms, black spot fungus, lichen on trees

Question 2

Describe eutrophication

Answer 2

1. Fertilizer is sprayed on fields to make plants grow better
2. Nitrates and phosphates left on the ground dissolve into water in the soil
3. Any of the nitrates and phosphates that aren’t soaked up go into surrounding rivers and streams etc. (also if it rains heavily they’ll be washed into them)
4. The presence of extra nitrates and phosphates in water sources is called eutrophication
5. Eutrophication encourages water plants including algae to grow
6. Algae form dense mats on the water, blocking out sunlight
7. Plants that don’t get enough light die
8. Decaying organisms in water use up oxygen to break down
9. The amount of oxygen in water decreases
10. Animals living in the water can’t get enough oxygen so they die

Question 3

Revise carbon cycle

Answer 3

Look at answers and see how you did