Fieldwork Investigations (Cambridge (CIE) IGCSE Environmental Management): Exam Questions

The scientist investigates the effect of three different fertilisers on the crop yield of maize plants.

Table 3.1 shows the results of the investigation.

Table 3.1

The investigation uses a control. The control is pure water.

Suggest why a control is used in this investigation.

Figure 1.1 shows data collected at a farm in Finland.

A student uses the data in Figure 1.1 to make two conclusions:

• February is always the wettest month in Finland.

• The temperature in October is always higher than the temperature in November in Finland.

Suggest two limitations of these conclusions.

Explain these limitations.

In 2022, two populations of giant African land snails were found in the state of Florida, USA.

Figure 2.2 shows the location of these two populations.

Give the direction of population 2 from population 1.

A scientist wants to use a random sampling strategy to estimate the population of giant African land snails in Florida.

Describe a random sampling strategy to estimate the population of giant African land snails in Florida.

In your answer include a method to:

• select the area to sample

• collect and record your data

• estimate the population of giant African land snails in Florida.

The scientist also uses a systematic sampling strategy to estimate the population of giant African land snails.

Suggest benefits and limitations of using a systematic sampling strategy to estimate the population of giant African land snails in Florida.

The scientist investigates the effect of three different fertilisers on the crop yield of maize plants.

Table 3.1 shows the results of the investigation.

Table 3.1

The scientist concludes:

'Adding fertiliser to maize crops decreases the number of days until harvest.'

Explain one way the data:

supports the conclusion

does not support the conclusion

The scientist investigates the effect of three different fertilisers on the crop yield of maize plants.

Table 3.1 shows the results of the investigation.

Table 3.1

Give one conclusion about the effect of fertilisers on the crop yield of maize.

Justify your conclusion.

The scientist investigates the effect of three different fertilisers on the crop yield of maize plants.

Table 3.1 shows the results of the investigation.

Table 3.1

State the independent variable in this investigation.

The scientist investigates the effect of three different fertilisers on the crop yield of maize plants.

Table 3.1 shows the results of the investigation.

Table 3.1

State one dependent variable in this investigation.

The scientist investigates the effect of three different fertilisers on the crop yield of maize plants.

Table 3.1 shows the results of the investigation.

Table 3.1

State two control variables in this investigation.