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CAIE IGCSE Biology 20.1.1 Humans Have Increased Food Production Questions

Learn how machinery, fertilisers, insecticides, herbicides and selective breeding increase food production.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • explain how machinery allows cultivation of larger areas and improves efficiency, and how fertilisers improve crop yields
  • explain how insecticides improve crop quality or yield and how herbicides reduce competition from weeds
  • describe selective breeding as a method of improving production by crop plants and livestock

CAIE IGCSE Biology 20.1.1 Humans Have Increased Food Production Questions question 1

[Maximum number: 11]

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

Table 6.1

[ 6 ]

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

[ 3 ]

Question (ii)

(ii)

Discuss factors, other than dosage, that should be considered to prevent the insecticide damaging the environment.

[ 3 ]

Question (b)

(b)

Describe the advantages to farmers of using insecticides.

[ 2 ]

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.

[ 3 ]
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