0654 B13 Impacts of Humans on Ecosystems Quiz

The diagram represents the carbon cycle. Which process is represented by arrow X?

The graph shows the increase in the human population of the world since 1630. What was the longest time taken for the population to double?

The graphs show the number of carnivores in a habitat over a period of time. At time X the herbivores in their food chain are removed from the habitat. Which graph shows the effect of this on the number of carnivores?

The diagram shows the positions of four farms and the concentrations of nitrate at different points in a river. Which farm is likely to have been using too much fertiliser on its land?

The table shows some information about two closely related species of sea bird. Sewage pollution at the mouth of a river destroys its fish stocks. What is likely to happen to local populations of these birds?

Three human activities are listed. 1 burning fossil fuels 2 deforestation 3 overusing fertilisers Which activities can cause the change shown in the graph?

 What is reduced after deforestation?

The diagram shows four positions on a river where water samples were taken. Which graph shows oxygen concentrations in the river?

A large amount of herbicide is applied to a field. Heavy rainfall carries much of it into a nearby lake. What will be the effect of this on the lake?

The table shows the amount of carbon dioxide in the atmosphere in three different years. What is the most likely cause of this change?

Which two gases both contribute to global warming?

Over-use of fertilisers on farmland causes the chemicals in the fertilisers to be washed into ponds and lakes. This causes eutrophication resulting in the following events. 1 algae grow 2 fish die 3 bacteria grow 4 oxygen decreases What is the correct sequence of these events?

The concentration of a pesticide in the tissues of the organisms in the following food chain was measured. Which bar on the chart represents the large fish?

The diagram shows how sewage is treated. Why is air bubbled through the aeration tank?

 Three human activities are listed. 1 burning fossil fuels 2 deforestation 3 overusing fertilisers Which activities can cause the change shown in the graph?

What is a reason for conserving plant species?

What is reduced after deforestation?

The diagram shows four positions on a river where water samples were taken. Which graph shows oxygen concentrations in the river?

Which process may result in eutrophication in a lake?

Which two gases are the biggest contributors to the greenhouse effect?

Untreated sewage is released into a river at point X. Which graph correctly shows changes in oxygen concentration of the water as the river flows away from X?

What changes in combustion and deforestation increase carbon dioxide in the atmosphere?

What is the principal source of energy input into a biological system?

Some of the stages of eutrophication are listed. 1 death of organisms requiring dissolved oxygen in water 2 increased availability of nitrate and other ions 3 increased decomposition after death of producers 4 reduction in dissolved oxygen What is the correct order of these stages in eutrophication?

The list shows changes that occur in a lake which is polluted by nitrogen-containing fertiliser. 1 decomposers feed on plants 2 growth of algae increases on the lake’s surface 3 oxygen levels decrease in the lake 4 underwater plants die In which order do these changes occur?

The bloodworm is an organism that is found in heavily polluted water. The diagram shows where raw sewage flows into a river. Where would there be fewest bloodworms?

What are the possible effects of deforestation?

Large areas of tropical forests have been cleared to grow monocultures of palm oil plants. Which effect will this have on the ecosystem?

What is not a reason for using chemical fertilisers in food production?

The diagram shows how sewage is treated. Why is air bubbled through the aeration tank?