Human interaction

Question 1

What are material cycles

Answer 1

Material cycles show how compounds i.e. carbon dioxide cycle through living organisms i.e animals, decomposers and trees etc. And make it back to where they initially were.

Question 2

Give a description of the carbon cycle

Answer 2

CO2 in the atmosphere is used by plants to retire. The plants then die and detritus feeders(worms and maggots) decompose the plants and animals that eat the plants. Th e carbon is then released back into the atmosphere. Humans also breathe out CO2, this also releases carbon into the atmosphere.

Question 3

List 3 of the main molecules that make up out bodies

Answer 3

Any out of DNA, fats, proteins or carbohydrates

Question 4

Why is the amount of carbon finite

Answer 4

Because earth is a closed system

Question 5

How is carbon released from some fossil fuels

Answer 5

The fuels are burned

Question 6

List two examples of carbon sinks

Answer 6

Limestone and carbon dioxide

Question 7

What two things is carbon cycled through

Answer 7

Living organisms in the environment and the carbon cycle

Question 8

List the word equation for Photosynthesis

Answer 8

carbon dioxide + water (along with light)—> glucose + oxygen

Question 9

List the word equation for respiration

Answer 9

Glucose + oxygen—> carbon dioxide + water

Question 10

List the word equation for combustion

Answer 10

Fuel + oxygen —> carbon dioxide + water

Question 11

What is the role of photosynthesis in the carbon cycle

Answer 11

Photosynthesis uses carbon along with water to produce glucose and oxygen

Question 12

What is the role of respiration in the carbon cycle

Answer 12

Living organisms respire and release carbon dioxide into the atmosphere

Question 13

What is the role of combustion in the carbon cycle

Answer 13

When burning fossil fuels, stored carbon dioxide is released into the atmosphere

Question 14

What three conditions must be present when a decomposed breaks down and organism

Answer 14

The condition must be warm, moist and oxygen rich

Question 15

Why is a warm climate needed for decomposers

Answer 15

The enzymes will not function quickly if the conditions are not warm

Question 16

Why is a moist climate needed for decomposers

Answer 16

Moisture is needed for bacteria to grow and multiply

Question 17

Why is an oxygen rich climate needed for decomposers

Answer 17

Aerobic respiration

Question 18

What problem occurs when fertiliser from farms enter a pond

Answer 18

As the fertiliser enters the water, the nutrients are consumed by algae and plants alike. The plants overgrow and form a thick layer on top of the pond. This prevents the light from reaching the plants which means that they cannot photosynthesise. The plants then die and microorganisms decompose them. As a result of the lack of oxygen due to the plants being dead, the decomposers quickly use all of the available oxygen. All life then dies.

Question 19

Explain how fossil fuels being burned can lead to air pollution.

Answer 19

When fossil fuels are burned, they release smoke. This contaminates the air. CO2 also pollutes the air.

Question 20

How can the burning of fossil fuels lead to a reduced global temperature

Answer 20

The smoke produced can form a layer under the atmosphere. This can lead to a global dimming which would result in a reduction of the average global temperature. This would also cause severe problems to our cardiovascular systems.

Question 21

How can impurities in fossil fuels cause acid rain.

Answer 21

Chemicals such as sulphur dioxide mix with rain water and form a contaminated acid rain.

Question 22

List three problems that are caused by acid rain.

Answer 22

Plants wont grow because the soil is too acidic, erodes limestone/damages statues and corrodes metal.

Question 23

list three causes of global warming

Answer 23

CO2 and gasses in the atmosphere, oil coal, growing population

Question 24

What is Biodiversity

Answer 24

Biodiversity is the measure of how many different species live in an ecosystem

Question 25

What is a keystone organism

Answer 25

A keystone organism is an organism that other organisms depend on

Question 26

What does a great biodiversity ensure

Answer 26

A great biodiversity ensures the stability of ecosystems by reducing the dependence of one species on another one for food, water and the maintenance of the physical environment

Question 27

List two measures of maintaining biodiversity

Answer 27

Any out of:Breeding programs for endangered species, Protection and regeneration of rare habitats and reintroduction of field margin and hedgerows, recycling resources or reduction of deforestation and carbon dioxide emotions.

Question 28

Explain how your chosen methods do this.

Answer 28

Check book.