B8 - Humans and the Environment 2

Question 1

these were not present at site A

give an explanation why

Answer 1

• nitrates leaked into rive
• causing eutrophication
• algae bloom explanation (cont.)

Question 2

explain which one of theses species is most likely to be found near a coal burning power station

Answer 2

• Species 2
• because coal powered station produces sulfur dioxide gas
• species 2 is tolerant of sulfur

Question 3

explain how plants get the nitrogen they need to make protein

Answer 3

• plants use nitrogen take in as nitrates
• fertilisers / compost
• nitrification
• absorption through roots by active transport

Question 4

describe how drought resistant crop plants could lead to increase in food supply

Answer 4

• genetic variation means some plants will be tolerant of drought conditions
• cross pollinate