Ecological Relationships and Energy Flow

Question 1

How can changes in population be represented mathematically?

Answer 1

(birth rate + immigration) - (death rate + emigration)

Question 2

Name three factors that are contributing to population growth.

Answer 2

🚝 Increase in food supply
🚝 Improvements in sanitation
🚝 Improvements in medical care

Question 3

What is the greenhouse effect?

Answer 3

The greenhouse effect is where carbon dioxide and some other gasses trap heat from the sun’s rays within the atmosphere.

Question 4

What is global warming?

Answer 4

It is believed that increases in carbon dioxide are increasing the greenhouse effect and this is causing the earth to heat up.

Question 5

List four effects of global warming.

Answer 5

🚝 Climate change - more extreme weather
🚝 Polar ice caps melting
🚝 Increased flooding
🚝 More land becoming desert

Question 6

Name three things that can be done to reduce global warming.

Answer 6

🚝 Plant more trees
🚝 Reduce deforestation
🚝 Burn fewer fossil fuels

Question 7

What is a species?

Answer 7

A species is a group of organisms, with shared features, which can breed together to produce fertile offspring.

Question 8

The name given to the amount of carbon we use.

Answer 8

Our carbon footprint

Question 9

What are the causes of acid rain?

Answer 9

🚝 Burning fossil fuels releases sulphur dioxide

🚝 These combine with water in the atmosphere and fall as sulphurous acid - acid rain

Question 10

What are the effects of acid rain?

Answer 10

🚝 Trees are killed by defoliation i.e. they lose their leaves and needles
🚝 Acid rain also kills trees by creating more acidic soil
🚝 Aluminium released from acidic soil into lakes kills fish