Mary Jones and Geoff Jones Solutions for Chapter: Plant Nutrition, Exercise 2: Exercise 6.2
Mary Jones Biology Solutions for Exercise - Mary Jones and Geoff Jones Solutions for Chapter: Plant Nutrition, Exercise 2: Exercise 6.2
Attempt the free practice questions on Chapter 6: Plant Nutrition, Exercise 2: Exercise 6.2 with hints and solutions to strengthen your understanding. Biology for Cambridge IGCSE Workbook 4 th Edition Digital Access solutions are prepared by Experienced Embibe Experts.
Questions from Mary Jones and Geoff Jones Solutions for Chapter: Plant Nutrition, Exercise 2: Exercise 6.2 with Hints & Solutions
An experiment was performed to find out how fast a plant photosynthesised as the concentration of carbon dioxide in the air around it was varied. The results are shown in the table
| Percentage concentration of carbon dioxide | Rate of photosynthesis /arbitrary units |
| 0.00 | 0 |
| 0.02 | 33 |
| 0.04 | 53 |
| 0.06 | 68 |
| 0.08 | 79 |
| 0.10 | 86 |
| 0.12 | 89 |
| 0.14 | 90 |
| 0.16 | 90 |
| 0.18 | 90 |
| 0.20 | 90 |
Plot these results on the grid below and draw a line.
The experiment was repeated at a lower light intensity. The results are shown in the table. Plot these values on your graph and draw a line. Label the two lines.
| Percentage concentration of carbon dioxide | Rate of photosynthesis /arbitrary units |
| 0.00 | 0 |
| 0.02 | 20 |
| 0.04 | 29 |
| 0.06 | 35 |
| 0.08 | 39 |
| 0.10 | 42 |
| 0.12 | 45 |
| 0.14 | 46 |
| 0.16 | 46 |
| 0.18 | 46 |
| 0.20 | 46 |
State the carbon dioxide concentration of normal air.
An experiment was performed to find out how fast a plant photosynthesised as the concentration of carbon dioxide in the air around it was varied.
The experiment was performed at a lower light intensity. The results are shown in the graph. Use the graph to determine the rate of photosynthesis in normal air in higher light intensity.
Up to what concentration is carbon dioxide a limiting factor for photosynthesis in low light intensity?
Above 0.04% concentration, what is the limiting factor for photosynthesis when the plant is exposed to low light intensity?
Farmers and market gardeners often add carbon dioxide to the air in glasshouses where crops are growing. Use above graph to explain the advantage of doing this.
It is expensive to add carbon dioxide to glasshouses. Suggest a suitable concentration of carbon dioxide to add to a glasshouse in high light intensity, to obtain a good financial return from the sale of the crop. Explain your answer.
