Buy Organisation Of An Ecosystem Assignment

Buy Organisation Of An Ecosystem Assignment
Buy Organisation Of An Ecosystem Assignment
Quick questions
1 Describe what happens to the numbers of predators and prey in a
stable community.
2 Name the process that removes carbon from the atmosphere in
the carbon cycle.
3 Give two examples of processes that release carbon into the
atmosphere in the carbon cycle.
Exam-style questions
4 Feeding relationships within a community can be represented by
food chains.
Look at this food chain:
grass → hare → lynx
4–1 Give the term used to describe the organism at the start of the
food chain. [1]
4–2 Name the prey organism in the food chain. [1]
4–3 Name the secondary consumer in the food chain. [1]
4–4 Explain the importance of grass in the food chain. [2]
p433–4 4.7.2.1
p451–2 4.7.2.2
p451–2 4.7.2.2
p451 4.7.2.1
7 Ecology
48
4–5 The graph in Figure 3 shows the changes in the populations of
the lynx and the hare between 1890 and 1920. Thousands of hares Thousands of lynx
80
60
40
20
0 0
2
4
6
Year
1890
8
1900 1910 1920
Key
hares
lynx
Figure 3
In 1894, there was a peak in both the lynx and hare populations.
Calculate how many times greater the hare population was than
the lynx population.
Give your answer to three significant figures. [3]
4–6 Describe the changes in the hare population between 1910 and 1915. [2]
4–7 Suggest an explanation for the changes in the hare population
between 1910 and 1915.
Use information from Figure 3. [2]
Total: 12
5 A student uses a sampling technique to investigate the distribution of a
plant called Ribwort plantain. The student uses this equipment:
• 0.25m2 quadrat
• 20m tape measure.
5–1 Describe how the student would use the equipment to investigate
the distribution of plantain across a footpath. [6]
5–2 The student uses the equipment to estimate the number of
plantain in a 400m3 field.
The student uses random sampling and counts the number of
plantain in a large number of quadrats.
Give the reasons why the student uses random sampling and a
large number of quadrats. [2]
5–3 Table 2 shows the student’s results.
Quadrat number 1 2 3 4 5 6 7 8 9 10
Number of plantain 0 5 1 0 2 1 3 1 2 4
Table 2
Find the mode and median number of plantain per quadrat. [2]
MS4a
WS3.2
MS4a
WS3.2
MS4a
WS3.5
p447–9 4.7.2.1 RP9
QWC
AT3,6
WS2.2
WS2.3,
2.5
WS3.3
MS2f
Biodiversity and the effect of human interaction on ecosystems
49
5–4 Calculate the mean number of plantain per quadrat. [1]
5–5 The area the student sampled was 20m × 20m.
Estimate the total number of plantain in this area. Use your
calculated value for the mean number of plantain per quadrat. [2]
Total: 13
6 Figure 4 shows the water cycle.
condensation
A transpiration
B
Figure 4
Name the processes labelled A and B on Figure 4. [2]
6–1 One of the processes shown on Figure 4 is transpiration. Explain
what transpiration is. [2]
6–2 The carbon cycle is important in recycling carbon for living
organisms. Explain how the carbon in dead plants can become
part of a living plant.
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