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Edexcel IGCSE Biology 4.5 Abiotic and Biotic Factors Questions

Practise using field evidence to explain how environmental conditions, competition, disease and grazing affect populations.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • identify or control abiotic variables when comparing organism distribution
  • interpret tables or graphs to link population change with grazing, competition or disease
  • calculate percentage population change and evaluate whether data support an ecological claim

Edexcel IGCSE Biology 4.5 Abiotic and Biotic Factors Questions question 1

[Maximum number: 5]

A group of students investigate the biodiversity in two fields, A and B.
Field A is grazed by cattle and field B has no cattle.

The students investigate the plant species in each field.

They counted the number of each species in five 0.5 m×0.5 m0.5 \mathrm{~m} \times 0.5 \mathrm{~m} quadrats.
They repeated this for each field.
Table 1 shows their results.

Table 1

Table 1

The students conclude that grazing affects the species in field A .

Using information in Table 1 and your own knowledge, discuss the students' conclusion.

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