Investigate and describe the effect of physical activity on the heart rate
Investigate and describe the effect of physical activity on the heart rate
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IGCSE Biology
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State that the activity of the heart may be monitored by: ECG, pulse rate and listening to sounds of valves closing
State that the activity of the heart may be monitored by: ECG, pulse rate and listening to sounds of valves closing
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Describe the single circulation of a fish
Describe the single circulation of a fish
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Describe the circulatory system as a system of blood vessels with a pump and valves to ensure one-way flow of blood
Describe the circulatory system as a system of blood vessels with a pump and valves to ensure one-way flow of blood
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Explain why some parts of a plant may act as a source and a sink at different times
Explain why some parts of a plant may act as a source and a sink at different times
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Describe: (a) sources as the parts of plants that release sucrose or amino acids (b) sinks as the parts of plants that use or store sucrose or amino acids
Describe: (a) sources as the parts of plants that release sucrose or amino acids (b) sinks as the parts of plants that use or store sucrose or amino acids
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Explain how and why wilting occurs
Explain how and why wilting occurs
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Explain the effects on the rate of transpiration of varying the following factors: temperature, wind speed and humidity
Explain the effects on the rate of transpiration of varying the following factors: temperature, wind speed and humidity
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Explain how water vapour loss is related to: the large internal surface area provided by the interconnecting air spaces between mesophyll cells and the size and number of stomata
Explain how water vapour loss is related to: the large internal surface area provided by the interconnecting air spaces between mesophyll cells and the size and number of stomata
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Investigate and describe the effects of variation of temperature and wind speed on transpiration rate
Investigate and describe the effects of variation of temperature and wind speed on transpiration rate
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Explain the risks to a species if its population size decreases, reducing genetic variation (knowledge of genetic drift is not required)
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Describe the use of artificial insemination (AI) and in vitro fertilisation (IVF) in captive breeding programmes
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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
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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
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Explain why organisms become endangered or extinct, including: climate change, habitat destruction, hunting, overharvesting, pollution and introduced species
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State that some resources can be conserved and managed sustainably, limited to forests and fish stocks
