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Summary IB Biology notes HL Chapter 4 £6.33
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Summary IB Biology notes HL Chapter 4

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This is a summary perfect for revision. I am an ex-ib student that graduated with 43 IB points and got 7 in Biology HL. Hope these notes help you as much as they helped me :)

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  • April 14, 2023
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C4.1 Species, Communities and Ecosystems
Definitions:
Key word Definition

Species a group of organisms that can interbreed and produce a fertile offspring

Population a group of organisms that of the same species that live in a particular area

Community a group of populations living and interacting together in a particular area

Ecosystem interaction between the community and its abiotic factors

Habitat environment in which a species is adapted to

Abiotic factors non-living factors (pH, temperature, type of soil)

Smallest to biggest: population --> community --> ecosystem


Autotrophs
● producers
● synthesise their own food/ organic compounds from other simple inorganic compounds.
● they gain organic nutrients from their abiotic environment

Phototrophs:

● produce organic compounds from inorganic by using light and chloroplasts (photosynthesis in plants)


Heterotrophs
● consumers
● obtain organic compounds through feeding on other organisms

Saprotrophs:

● decomposers
● obtain organic nutrients from dead organisms by external digestion
● they secrete digestive enzymes on dead organic matter and complex compounds are broken and
absorbed

, Detritivores:

● obtain organic nutrients from detritus (dead and particulate organic matter) by internal digestion


Order
Primary consumer = autotrophs
Secondary consumer = primary consumer
Tertiary consumer = secondary consumers/apex predator


Communities
● Ecology: study of relationships between living organisms and their interactions with their environment
● organisms are highly dependent on their physical environment in their community
● communities are self-sustained because the essential nutrients are constantly recycled
● least to most inclusive: species --> population --> community --> ecosystem

Nutrient cycle:

● organisms depend on their environment to supply necessary nutrient for survival by recycling these
nutrients
1. plants absorb carbon dioxide and water from their abiotic environment to photosynthesise and make
carbohydrates
2. consumers eat plants and this transfers the nutrients from one organism to the other
3. when the organism dies and decomposes the nutrients are released back into the soil/abiotic
environment
4. the cycle continues

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