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Edexcel IGCSE Biology 3.33 Variation Within a Species Questions

Practise variation questions by classifying traits from evidence and explaining how genetic or environmental differences affect survival.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • Classify characteristics as gene-only, environmental, or affected by both genes and environment.
  • Use data tables to explain how variation can improve survival in changing conditions.
  • Suggest genetic and environmental reasons for measured differences within a species.

Edexcel IGCSE Biology 3.33 Variation Within a Species Questions question 1

[Maximum number: 3]

A species of grass has a diploid chromosome number of 12.

Scientists use this method to investigate self-pollination and cross-pollination in a species of grass plant.
- take pollen grains from the anther of a flower
- place some of the pollen grains on the stigma of the same flower
- after one day, count how many of the pollen grains grow a pollen tube

Repeat the method but place the pollen grains on the stigma of a flower of a different plant.

The table shows the scientists' results.

Figure for Question Edexcel IGCSE Biology 3.33 Variation Within a Species Questions question 1 — Edexcel IGCSE Biology

Explain how the results of the investigation show that this species of grass plant is able to survive in a changing environment.

Use the information in the table to support your answer.

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