Summative Practice Chapter 10 – Question 1 (Form 5 Biology Textbook Exercise and Answer)

Question 1:
Figure 1.1 and Figure 1.2 show activities that threaten the ecosystem.

(a) State the environmental threats shown in Figure 1.1 and Figure 1.2.

(b) Name two pollutants being released from the activity shown in Figure 1.1.

(c) Based on Figure 1.1 and Figure 1.2, explain how those activities can cause the world to experience climate change.

(d) Discuss the effects of the activities in Figure 1.1 and Figure 1.2 towards the ecosystem.

Figure 1.1: Greenhouse effects
Figure 1.2: Deforestation

(b) Carbon dioxide gas, methane gas, nitrogen oxide gas and chlorofluorocarbon gas.
(Any two pollutants)

Deforestation activities cause reduction in the number of trees which carry out photosynthesis.
This causes an increase in the concentration of carbon dioxide in the atmosphere that will trap more heat in the atmosphere. The temperature of the Earth increases.

The effects of activity in Figure 1.1:
• Excessive heat trapped on Earth which causes climate change.
• Changes in rainfall distribution and snow.
• Increase in sea levels due to sea warming and ice melting at the poles.
• Draught and heat wave happen more frequent.

The effects of activity in Figure 1.2:
• Life loses their natural habitats.
• Flora and fauna extinction.
• Loss of rainwater catchment areas.
• Soil erosion happens which brings landslides and flash floods.

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