A student selected young plants that each had six roots of similar length. The plants were divided into two groups and grown under the same conditions.
In one group, 2 mm was removed from the tip of every root. The roots were measured immediately after this treatment and again after 6 days.
| Treatment | Mean total increase in length of the six roots on each plant after 6 days |
|---|---|
| No root tips removed | 72 mm |
| Tips removed from all six roots | 6 mm |
Explain how removing the root tips caused the difference in the results.
The student treated a third group of plants by removing the tips from three of the six roots on each plant.
Predict the mean total increase in length of the six roots after 6 days. Explain your answer.
74 exam-style questions on AQA GCSE Biology 2.3 Plant tissues, organs and systems, covering 2.3.1 Plant tissues and 2.3.2 Plant organ system. Each one has a worked solution and a mark scheme showing where the marks go.