The graph shows how waste is disposed of in three cities.
Which statement describes waste disposal in all of the three cities?
A) Burning is the second most common form of waste disposal.
B) Landfill is the main form of waste disposal.
C) More waste is burnt than recycled.
D) Recycling and burning together are the main forms of waste disposal.
▶️ Answer/Explanation
Ans: C
In all three cities, the graph shows that the percentage of waste burnt (orange bars) is consistently higher than the percentage recycled (blue bars). This makes statement C correct.
Statement A is false (burning is not always second), B is false (landfill is not the main method in City 3), and D is false (recycling + burning do not dominate in all cities). Thus, C is the only universally true statement.
Lichens are organisms that do not grow well in polluted air.
Which graph shows the change in the number of lichen species from the centre of a polluted city to the unpolluted countryside 15 km away?
A) 
B) 
C) 
D) 
▶️ Answer/Explanation
Ans: C
Lichens are sensitive to air pollution, so their numbers should increase as you move away from the polluted city center. The correct graph (C) shows few or no lichens near the city center (0 km) with a steady increase in species diversity as distance increases toward the cleaner countryside (15 km).