CAIE IGCSE Biology 20 Human Influences on Ecosystems Questions
Practise evaluating how food production, habitat loss, pollution and conservation alter biodiversity and ecosystem stability.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Covered syllabus points
Question 1
Question (a)
(a)
Researchers investigated four different insecticides to determine how effective they were at removing three different species of insects, A, B and C, from crop plants.
They tested different concentrations of each insecticide to find the minimum dosage required to remove 95 % of each insect population in two hours.
Each insecticide had the same cost per gram.
The results are shown in Table 6.1.
Table 6.1
Question (i)
(i)
Use the information in Table 6.1 to decide which one of the four different insecticides and which dosage would be the best choice for removing insects A, B and C from a field of crop plants.
Explain your choices.
insecticide dosage
explanation
Question (ii)
(ii)
Discuss factors, other than dosage, that should be considered to prevent the insecticide damaging the environment.
Question (b)
(b)
Describe the advantages to farmers of using insecticides.
Question (c)
(c)
Farmers also use other chemicals on their crop plants.
State the names of chemicals, other than insecticides, that are used by farmers on crop plants and explain their benefits.
Question 2
Which term describes the number of different species living in an area?
A
biodiversity
B
conservation
C
ecosystem
D
population
Question 3
The bloodworm is an organism that is found in heavily polluted water.
The diagram shows where raw sewage flows into a river.
Where would there be fewest bloodworms?
Question 4
Lignin is used to make a sustainable resource known as bioplastic.
Why is bioplastic a sustainable resource?
A
Lignin can be produced as rapidly as it is removed from the environment.
B
Lignin is found in xylem tissue.
C
Lignin is strong.
D
Lignin is waterproof.
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