IB Biology Topic 3 Cram sheets
Diversity of organisms
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Further diversity
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Classification & cladistics
Explore the classification of organisms, understanding the hierarchy of taxa and cladistics. Consider the criteria on which classification is based on, including the advantages of this method as well as factors contributing to deviation.
Gas exchanges
Explore the mechanism of gas exchange, a vital function in all organisms. Consider the conditions required for this process and how this differs amongst, plants and mammals.
Further gas exchange
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Transport
Discover the circulatory system, understanding the adaptations that sustain mammalian life. Explore the structures comprising plant stems, considering how these sustain plant life.
Further transport
Explore the movement of fluid and exchange of substances throughout the body, describing the cardiac cycle and considering how the circulatory system varies between fish and mammals. Discover the adaptations of xylem and phloem in plant transport.
Muscle & motility
Explore the mechanism of movement, an essential feature in all living organisms. Discover the structural adaptations of muscles, joints, and bones in enabling essential functions, including moving and breathing.
Body systems
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Plant systems
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Defence against infectious disease
Discover pathogens, considering the adaptations of the human body in preventing infection, including the role of the innate and adaptive immune system. Explore the mechanism of immunity and vaccination, relating this to common infectious diseases.
Reproduction
Discover the reproductive adaptations of plants and animals, understanding how this contributes to variation. Understand the anatomy of male and female reproductive systems and hormonal adaptations, including the menstrual cycle.
Further reproduction
Discover the sexual development of males and females, exploring their reproductive adaptations. Explore the role of hormones in pregnancy and delivery, as well as the medical uses of hormone replacement therapy.
Monogenic inheritance
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Polygenic inheritance
Explore gene linkage, understanding how this contributes to characteristics amongst populations. Discover how punnet grids, dihybrid crosses, and chi-squared tests can represent this relationship.
Homeostasis
Discover homeostasis, the balance of life. Understand the role of negative feedback loops, thermoregulation, and hormones in balancing the bodily functions of humans.
Further homeostasis
Discover the homeostatic adaptations of the kidneys and circulatory system, understanding how water balance and blood supply is maintained.