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IBDP Biology- Species,Communities and Ecosystems (2/3)

Topic 4 - Nutrient cycle and absorption

· IBDP BIOLOGY,IB

In this second part of the IBDP Biology Blog, we will look at:

  • Nutrient cycles
  • Absorption of food from different organisms
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Energy Absorption: Autotrophs  

Autotrophs: Convert Carbon Dioxide [atmosphere/dissolved in water] into Organic Compounds

Plants synthesise sugars [Glucose] then converted into organic compounds [Starch, Cellulose, Lipids, Amino Acids]

Inorganic Nutrient Compounds [Water, Carbon Dioxide, Nitrates, Phosphorous, Oxygen] obtained from Abiotic Environment [Soil, Air, Water]

Energy Source: Light

U3: Species have either heterotrophic or autoprohic method of nutrition [some species have both]

All organisms need organic molecules [Amino Acids] to carry out the functions of life [growth, motabolism and reproduction]  

Energy Absorption: Heterotrophs  

Heterotrophs: Rely on other organisms for energy

In IBDP Biology, we know that heterotrophs cannot make the carbon compounds needed

*Obtain them from other organisms

Types of Heterotrophs:

  • Consumers
  • Detrivores
  • Saprotrophs

Mixotrophs: Plants and Algae use a combination of different modes of nutrition

Euglena will photosynthesise in suffcient light feeding as an autotroph but can also ingest particles of food by phagocytosis which it then digests

  • Venus flytrap photocynthesises but can also catch insects and spiders to compensate for nutrient poor soil  

Nutrient Cycle 

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Nutrients: Elements required by an organism for growth and metabolism [carbon, nitrogen, phosphorous]

The supply of nutrients is limited so ecosystems constantly recycle the nutrients between organisms. Everyone wants organic nutrients!

  • Autotrophs: 

Convert 

nutrients from an inorganic form into organic molecules

  • Heterotrophs: 

Ingest other organisms to gain organic form of 

nutrients 

  • Saprotrophs: 

Breakdown organic nutrients to gain energy and in the process release nutrients back into inorganic molecules

Summary of Nutrient Cycle

  • Supply of nutrients is limited therefore an ecosystem recycles
  • Autotrophs convert inorganic into organic
  • Heterotrophs ingest organisms to gain organic
  • Saprotrophs breakdown organic and release inorganic 

That's the end of part 2! Good job!

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