Post Type for Questions and Answers
Explain the risks to a species if its population size decreases, reducing genetic variation (knowledge of genetic drift is not required)
Describe the use of artificial insemination (AI) and in vitro fertilisation (IVF) in captive breeding programmes
Describe the reasons for conservation programmes, limited to: (a) maintaining or increasing biodiversity (b) reducing extinction (c) protecting vulnerable ecosystems (d) maintaining ecosystem functions, limited to nutrient cycling and resource provision, including food, drugs, fuel and genes
Describe how endangered species can be conserved, limited to: (a) monitoring and protecting species and habitats (b) education (c) captive breeding programmes (d) seed banks
Explain why organisms become endangered or extinct, including: climate change, habitat destruction, hunting, overharvesting, pollution and introduced species
State that some resources can be conserved and managed sustainably, limited to forests and fish stocks
Describe a sustainable resource as one which is produced as rapidly as it is removed from the environment so that it does not run out
Explain the process of eutrophication of water, limited to: • increased availability of nitrate and other ions • increased growth of producers • increased decomposition after death of producers • increased aerobic respiration by decomposers • reduction in dissolved oxygen • death of organisms requiring dissolved oxygen in water
Describe the sources and effects of pollution of the air by methane and carbon dioxide, limited to: the enhanced greenhouse effect and climate change
Describe the effects of non-biodegradable plastics, in both aquatic and terrestrial ecosystems