Question

gcse biology ecology & ecosystems high demand questions questionsheet 14 the table shows the amount of carbon dioxide in the atmosphere from 1800 to 2000. (a) on a graph grid, plot a line graph of these figures. (b) during which 50 year period has the rise in carbon dioxide level been the greatest? (c) the mass of carbon dioxide released each year is currently 750 million tonnes. of this mass, 80% comes from the combustion of fuel and the remainder from deforestation. calculate the mass which comes from combustion.

Explanation:

Step1: Calculate the rise for each 50 - year period

For 1800 - 1850: \(285 - 280=5\) ppm
For 1850 - 1900: \(300 - 285 = 15\) ppm
For 1900 - 1950: \(330 - 300=30\) ppm
For 1950 - 2000: \(365 - 330 = 35\) ppm

Step2: Compare the values

We have the values \(5\), \(15\), \(30\), \(35\)

Step3: Calculate the mass from combustion

The total mass of \(CO_2\) released each year is \(M = 750\) million tonnes. The percentage from combustion is \(p = 80\%=\frac{80}{100}=0.8\)
The mass from combustion \(m = M\times p\)
\(m=750\times0.8 = 600\) million tonnes

Answer:

(b) The 50 - year period from 1950 to 2000 has the greatest rise in carbon dioxide level.
(c) The mass of carbon dioxide that comes from combustion is \(600\) million tonnes.