Biology 3b Summary Questions

Question 1

What is happening to the worlds population and why?

Answer 1

It is increasing due to:

• better healthcare and medicine, less death from disease
• better farming methods, less death from starvation

Question 2

What are three ways that the rising population is affecting the environment?

Answer 2

1) sewage, toxic chemicals and fertilisers pollute water systems
2) nuclear waste is underground, household waste is in landfill
3) smoke and gases released into the atmosphere pollute the air

Question 3

What are the four main activities that take up land?

Answer 3

1) farming
2) buildings
3) dumping waste
4) quarrying for metal ores

Question 4

What are five stores of carbon?

Answer 4

1) peat bogs
2) oceans
3) lakes
4) ponds
5) green plants

Question 5

Why is it important to have stores of carbon?

Answer 5

They mean CO2 is removed from the atmosphere.

Question 6

What are two important greenhouse gases?

Answer 6

Methane and Carbon Dioxide.

Question 7

What are three reasons why large areas of forest are cut down?

Answer 7

1) timber for building materials
2) clear land for farming
3) paper from wood

Question 8

Apart from a reduction in biodiversity, what three other problems can deforestation lead to?

Answer 8

1) CO2 is released
2) more methane in the atmosphere
3) less CO2 taken in

Question 9

Does fermentation involve aerobic or anaerobic respiration?

Answer 9

Fermentation involves the anaerobic respiration of yeast.

Question 10

What are the main two components of biogas?

Answer 10

Methane and carbon dioxide.

Question 11

A farmer has a field, he plans to grow corn in it and then feed the corn to his cows, which he raises for meat. How could the farmer use the field more efficiently to produce food for humans?

Answer 11

Intensively farm the cows, and also reduce the number of stages in the food chain.

Question 12

Why do chickens kept in tiny cages in heated sheds need less food?

Answer 12

They have less room to move, so need less energy and also the heater means that they give out less energy as heat.

Question 13

What microorganism is the main source of mycoprotein?

Answer 13

Fungi.

Question 14

What is ‘sustainable food production’?

Answer 14

Having enough food without using resources faster than they renew.

Question 15

What are two ways that fish stock can be conserved?

Answer 15

1) fishing quotas

2) net size