The passage describes human activities and their negative impacts on ecosystems. Complete the passage by writing a suitable word or words in each of the blank spaces.
The intensive application of chemical [1] _______________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}_______________ on farmland can lead to leaching into nearby waterways. This enrichment of nutrients triggers a rapid growth of algae on the water surface, forming an [2] _______________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}_______________. This layer prevents sunlight from reaching aquatic plants below, causing them to die. As these plants decay, populations of aerobic [3] _______________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}_______________ increase dramatically. Their respiration consumes large volumes of dissolved [4] _______________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}_______________, causing fish and other organisms to suffocate.
Terrestrial ecosystems are also severely affected by [5] _______________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}_______________, which is the large-scale clearance of forested land. This destruction reduces the rate at which carbon dioxide is absorbed from the atmosphere by [6] _______________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}_______________. If the cleared vegetation is burned, significant quantities of [7] _______________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}_______________ are discharged into the atmosphere. This gas, alongside [8] _______________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}_______________ produced by livestock farming, acts as a [9] _______________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}_______________ gas. These gases absorb re-radiated heat, leading to an enhanced greenhouse effect and [10] _______________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}_______________.
44 exam-style questions on Edexcel IGCSE Biology Human influences on the environment. Each one has a worked solution and a mark scheme showing where the marks go.