A scientist counted mitochondria in equal volumes of cytoplasm from food-transporting phloem cells and adjacent companion cells in three plant samples. The table shows the results.
| Plant sample | Mitochondria in equal volume of cytoplasm from food-transporting phloem cells | Mitochondria in equal volume of cytoplasm from companion cells |
|---|---|---|
| 1 | 8 | 116 |
| 2 | 12 | 154 |
| 3 | 10 | 150 |
Calculate the ratio shown below using the results from all three plant samples.
mean number of mitochondria in an equal volume of cytoplasm from food-transporting phloem cells : mean number of mitochondria in an equal volume of cytoplasm from companion cells
Give your answer in the form 1 : n.
Suggest why companion cells contain more mitochondria per equal volume of cytoplasm than food-transporting phloem cells. Predict the effect on the food-transporting phloem cells if aerobic respiration in the companion cells stopped.
282 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.