5 marksThe boxes on the left contain the names of processes from the carbon cycle.
The boxes on the right contain some descriptions of processes.
Draw one straight line from each process to link the process to its description.
An example has been done for you.
Did this page help you?
2 marksThe functioning of ecosystems relies on the cycling of nutrients.
Fig. 1 shows part of the nitrogen cycle.
Fig. 1
State the name of process A in Fig. 1 and give the type of organism that converts ammonium ions to nitrate ions.
3 marksDescribe how nitrate ions enter the roots of plants shown by arrow C on Fig. 1.
1 markState the process that occurs at B.
Did this page help you?
Suggest why it is important that molecules that contain nitrogen are added to the soil.
Did this page help you?
5 marksFig. 1 represents the carbon cycle.
Fig. 1
Use Fig. 1 to answer the following questions.
Name the process labelled U.
[1]
Name a group of organisms that are responsible for the process labelled W.
[1]
List two letters that identify respiration.
[2]
State which letter identifies photosynthesis.
3 marksSuggest reasons why the mean percentage of carbon dioxide in the atmosphere has increased during the last 100 years.
Did this page help you?
7 marksThe functioning of ecosystems relies on the cycling of nutrients.
Fig. 1 shows part of the nitrogen cycle.
Fig. 1
State the name of process A in Fig. 1 and give the type of organism that converts ammonium ions to nitrate ions.
[2]
Describe how the nitrate ions used in process C enter the roots of plants.
[3]
State the name of the structure in plant cells where process D occurs.
[1]
State the process that occurs at B.
[1]
Did this page help you?
6 marksFig. 1 shows a pyramid of biomass and part of the carbon cycle.
Fig. 1
[1]
[1]
2 marksSome fungi and bacteria are decomposers
Define the term decomposer.
[1]
[1]
5 marksDescribe how human activities are affecting the carbon cycle.
Did this page help you?
3 marksFig. 1 shows part of the carbon cycle.
Fig. 1
Identify the processes shown by arrows A, B and C on Fig. 1.
Choose words from the list.
| combustion decomposition excretion feeding fossilisation |
2 marks(i)
On Fig. 1 draw one arrow to represent photosynthesis.
Label this arrow with a letter D.
[1]
On Fig. 1 draw one arrow to represent respiration.
Label this arrow with a letter E.
Did this page help you?