Recycling

Question 1

explain what a fish does to its food

Answer 1

the fish eat it and digest it. They use the digested food molecules to build up new chemicals for growth

Question 2

what causes decaying?

Answer 2

animals dying

Question 3

what chemicals are created during decaying?

Answer 3

carbon and nitrogen are recycled

Question 4

what do plants recycle?

Answer 4

carbon when they take in carbon dioxide

Question 5

what else do plants recycle?

Answer 5

nitrogen when they take in nitrates

Question 6

name an element that is recycled naturally?

Answer 6

carbon dioxide

Question 7

what does carbon dioxide make?

Answer 7

carbon

Question 8

what happens when plants are eaten?

Answer 8

the carbon passes along the animals

Question 9

how is carbon dioxide put back into the atmosphere

Answer 9

plants and animals respiring. decomposers such as bacteria and fungi in the soil respiring. Burning of fossil fuels

Question 10

why does recycling of nutrients take longer in acidic or waterlogged soils than in well drained soils?

Answer 10

because the lack of oxygen hinders microbial respiration

Question 11

what do the shells of marine animals such as molluscs contain?

Answer 11

carbonates

Question 12

what do other marine animals such as corals and microscopic algae cover themselves in?

Answer 12

calcium carbonate

Question 13

how was limestone formed?

Answer 13

from a collection of shells collected on the sea bed

Question 14

how does limestone release carbon dioxide?

Answer 14

it is attacked by rain which is often acidic. Carbon dioxide reacts with the rain to form carbonic acid. The acid weathers the rock and carbon dioxide if released

Question 15

how can carbon dioxide be absorbed?

Answer 15

by the oceans and held in a carbon sink

Question 16

how else is carbon dioxide emitted?

Answer 16

erupting volcanoes and forest firess

Question 17

what is nitrogen another example of?

Answer 17

an element that is recycled naturally

Question 18

why is nitrogen hard for plants and animals to use?

Answer 18

because it is very uncreative and does not combine easily with other elements

Question 19

what can nitrogen in dead animals and plants be recycled as?

Answer 19

decomposers

Question 20

what are fungi and bacteria in the soil? and what do they do?

Answer 20

decomposers. They decay dead animals and plants

Question 21

what does this release and what can these be used by?

Answer 21

it releases nitrogen and other elements. These elements can be used by living organisms

Question 22

what do plants and animals need nitrogen for?

Answer 22

to make proteins for growth and for making enzymes that control the reactions necessary for life.

Question 23

what do decomposers do in the nitrogen cycle?

Answer 23

break down proteins in dead bodies and urea in liquid animal waste, releasing ammonia

Question 24

why do babies napies smell of ammonia? and what can this cause?

Answer 24

because bacteria convert the urea in urine into ammonia. This can cause nappy rash because ammonia is a strong alkali

Question 25

what does nitrifying bacteria do?

Answer 25

converts ammonia into nitrates

Question 26

what does nitrogen fixing bacteria do?

Answer 26

they fix nitrogen gas and convert it into ammonia or nitrates and then into amino acids to form proteins

Question 27

what does some bacteria do? and what are these bacteria called?

Answer 27

breaks down nitrates in the soil and release nitrogen back into our atmosphere. These are called denitrifying bacteria

Question 28

how does lightening fix nitrogen gas?

Answer 28

during a thunder storm, energy form the lightening is used to combine nitrogen and oxygen to form nitrogen oxides. These oxides dissolve in the rain and from nitrates in the soil.

Question 29

how do insectivorous obtain their nitrogen?

Answer 29

digest their bodies and absorb the nitrates.