B3 - Human impact

Question 1

Name 3 ways humans pollute the earth

Answer 1

• Sewage, fertiliser
• Air with smoke/gases
• Land with pesticides

Question 2

Name 2 impacts of deforestation

Answer 2

• Increased the rate of carbon dioxide from the burning and reduced rate of photosynthesis
• Lost food and habitats so loss of biodiversity

Question 3

How do peat bogs cause pollution

Answer 3

The destruction of peat bogs releases carbon dioxide and is used for compost. This compost is decayed by micro-organisms which respire

Question 4

What does sequestered mean

Answer 4

Kept in

So carbon dioxide is sequestered in plants and water

Question 5

How are ethanol based biofuels created

Answer 5

Fermentation (anaerobic respiration of yeast)

Digestion of starch to sugar by carbohydrase

Distillation

Question 6

How is biogas created

Answer 6

Anaerobic fermentation by bacteria

Waste material is broken down in biogas generators by having the optimum temperature and no oxygen

Question 7

How can we make food efficiently

Answer 7

• Preventing the animal from moving so it doesn’t lose energy from movement
• Keep the animal warm so it doesn’t have to maintain a body temperature

This raises ethical concerns

Question 8

Name 2 ways to make sustainable food production

Answer 8

• Fish stocks in the ocean are monitored

- Fishing quotas and nets to catch an allowable amount and not babies

Question 9

What is mycoprotein

Answer 9

A fungus used for quorn food, called fusarium

Question 10

Name 3 conditions of an industrial fermenter

Answer 10

• Air supply providing oxygen for aerobic respiration
• Stirrers to provide an even temperature
• A water cooled jacket surrounded as the respiring micro-organisms release energy