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  • Biology Factsheet: 59. Excretion

    Biology Factsheet: 59. Excretion

    Excretion is the removal of toxic waste products of metabolism from the body to the external environment. This enables these waste  products to be recycled for reuse by living organisms. This fa...

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  • Biology Factsheet: 60. Minerals in plants and animals

    Biology Factsheet: 60. Minerals in plants and animals

      Plants gain their minerals by direct absorption from the soil whereas animals gain their minerals via their diet. Although a wide range of mineral types are essential in both plants and a...

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  • Biology Factsheet: 61. Chloroplasts and mitochondria

    Biology Factsheet: 61. Chloroplasts and mitochondria

    This Factsheet summarises:  • The structural similarities and differences between chloroplasts and mitochondria.  • The functional similarities and differences between chloroplas...

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  • Biology Factsheet: 62. Animal tissues I: epithelia and blood

    Biology Factsheet: 62. Animal tissues I: epithelia and blood

    This Factsheet will explain what is meant by the term ‘tissue’ and describe the structure of epithelial tissues and blood. These are the  animal tissues that have most frequently bee...

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  • Biology Factsheet: 63. Pigments in plants

    Biology Factsheet: 63. Pigments in plants

    Pigments in plants have the following roles:  • the photosynthetic pigments trap solar energy and change it into chemical energy which enables the plant to fix carbon dioxide and  so ...

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  • Biology Factsheet: 64. Transpiration

    Biology Factsheet: 64. Transpiration

    Transpiration is the loss of water from the aerial parts of a plant. It aids transport of water and salts throughout the plant from the soil  to the leaves and helps to keep the leaves cool.&nbs...

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  • Biology Factsheet: 65. Conservation

    Biology Factsheet: 65. Conservation

    This Factsheet will explain the following topic areas which appear on modern A-level Biology syllabuses:  • the meaning of conservation, why it is needed and its importance.   • ...

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  • Biology Factsheet: 66. The physiology of exercise

    Biology Factsheet: 66. The physiology of exercise

    This factsheet summarises the aspects of exercise physiology that relate to skeletal muscles on current syllabuses. The student should  have a basic knowledge of the respiratory pathways, struct...

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  • Biology Factsheet: 67. Modern techniques in Biology: Genetics

    Biology Factsheet: 67. Modern techniques in Biology: Genetics

    The techniques and applications  of DNA finger printing and the polymerase chain reaction (PCR) are on most of the latest A-levelBiology syllabuses. This factsheet will describe these techniques ...

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  • Biology Factsheet: 68. Fieldwork techniques

    Biology Factsheet: 68. Fieldwork techniques

    By studying this factsheet the student should gain a knowledge of:  • the uses and limitations of sampling methods of plant populations, such as frame quadrats, point quadrats, line transec...

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