Which of these pollutants can cause bioaccumulation in the environment?
Fertilisers
Pesticides
Sewage
Which organisms in a food chain are most likely to suffer the serious effects of bioaccumulation?
Producers
Primary consumers
Secondary consumers
How does the pesticide DDT cause a reduction in the population of birds of prey?
It gives them cancer
It weakens their egg shells
It causes infections
What might scientists detect if raw sewage has been pumped into a river or lake?
High oxygen
Low carbon dioxide
Low oxygen
What is the name of the process in which nitrate fertilisers are washed from fields into rivers and lakes?
Leaching
Blooming
Decomposing
What is the name for an organism that scientists use to determine levels of pollution?
Producer
Indicator species
Extinct species
What effect does water pollution have on the pH of water?
It increases the pH above 7
It decreases the pH below 7
It causes a neutral pH 7
Which of these processes removes carbon dioxide from the environment?
Photosynthesis
Combustion
Respiration
Which product is formed when urea is broken down by bacterial urease enzymes?
Ammonia
Nitrogen
Nitrates
Which plants have root nodules that contain nitrogen-fixing bacteria?
Leguminous
Deciduous
Flowering