Questions and Answers

Describe the impacts humans have through: (a) over-harvesting of plant and animal species (b) introducing a non-native species to an ecosystem

Outline the causes and describe the consequences of deforestation, limited to its effects on: biodiversity, extinction, loss of soil, flooding and concentration of carbon dioxide in the atmosphere

Identify and state the factors affecting the rate of population growth for a population of an organism, limited to: food supply, competition, predation and disease

Outline the role of fungi and bacteria in decomposition

Explain why it is more energy efficient for humans to eat crop plants than to eat livestock that have been fed on crop plants

Explain why food chains usually have fewer than five trophic levels

Explain why the transfer of energy from one trophic level to another is inefficient

Describe food webs as networks of interconnected food chains and construct and interpret them

Describe the terms producer, consumer, herbivore, carnivore and decomposer