IB Biology Topic 3 Cram sheets

This page contains our IB Biology cram sheets for topic 3. By reviewing each one of these cram sheets, you will fully cover the content for IB Biology 'Organisms'.
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Cram Sheet in development
Subtopic A3.1

Diversity of organisms

The cram sheet for this sub-topic of the syllabus is not currently available. Check back with us later!

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Subtopic A3.1

Further diversity

The cram sheet for this sub-topic of the syllabus is not currently available. Check back with us later!

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Subtopic A3.2

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.

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Subtopic B3.1

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. 

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Subtopic B3.1

Further gas exchange

The cram sheet for this sub-topic of the syllabus is not currently available. Check back with us later!

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Subtopic B3.2

Transport

Discover the circulatory system, understanding the adaptations that sustain mammalian life. Explore the structures comprising plant stems, considering how these sustain plant life.

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Subtopic B3.2

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.

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Subtopic B3.3

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.

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Subtopic C3.1

Body systems

The cram sheet for this sub-topic of the syllabus is not currently available. Check back with us later!

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Subtopic C3.1

Plant systems

The cram sheet for this sub-topic of the syllabus is not currently available. Check back with us later!

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Subtopic C3.2

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.

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Subtopic D3.1

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.

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Subtopic D3.1

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.

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Subtopic D3.2

Monogenic inheritance

The cram sheet for this sub-topic of the syllabus is not currently available. Check back with us later!

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Subtopic D3.2

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.

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Subtopic D3.3

Homeostasis

Discover homeostasis, the balance of life. Understand the role of negative feedback loops, thermoregulation, and hormones in balancing the bodily functions of humans. 

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Subtopic D3.3

Further homeostasis

Discover the homeostatic adaptations of the kidneys and circulatory system, understanding how water balance and blood supply is maintained.

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Great Work!

You have now covered all of our topic 3 cram sheets for IB biology.
Now that you have completed these IB biology topic 3 cram sheets, dive into our topic 3 topic tests for the IB biology course.
IB biology topic 3 topic tests

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