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  • Biology Factsheet: 53. Parasites

    Biology Factsheet: 53. Parasites

      Parasitism is probably the commonest mode of existence on Earth, since nearly all organisms in nature have associated parasites. In most cases the association of parasite and host is well...

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  • Biology Factsheet: 54. Water potential

    Biology Factsheet: 54. Water potential

      Water potential strikes fear into many students.  However, in reality there are only five typical questions:  1. Here are two cells with different water potentials.  Which w...

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  • Biology Factsheet: 55. Effect of light on living organisms

    Biology Factsheet: 55. Effect of light on living organisms

    The effect of light on living organisms is a good example of a synoptic  topic, i.e. one which requires students to pull together information from  many different areas of the syllabus. &n...

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  • Biology Factsheet: 56. Autonomic nervous system

    Biology Factsheet: 56. Autonomic nervous system

    Prerequisite knowledge: Before studying this Factsheet the student should know about sensory, relay and motor neurones and their  structure, about myelinated and non myelinated fibres, and about...

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  • Biology Factsheet: 57. Oestrous cycles

    Biology Factsheet: 57. Oestrous cycles

    Mature female mammals characteristically have oestrous cycles during which they become fertile, can conceive and become pregnant.  Though humans have oestrous (menstrual) cycles which follow one...

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  • Biology Factsheet: 58. Reflex action

    Biology Factsheet: 58. Reflex action

    Reflex actions are simple automatic responses operated through the nervous system. They aid the survival of animals by, for example:  • producing protective reactions such as blinking, snee...

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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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