IBDP Environmental Systems & Societies Solutions Chapter 2 Notes

Ecosystems and Ecology


These notes have specially been curated by expert teachers to simplify and enlighten concepts given in IB ESS SL. The notes are comprehensive in nature and are sufficient to study the chapter in depth and one need not look for other resources beyond the notes provided on our website which can be accessed for free. The notes for Ecosystems and Ecology IBDP SL are available on our official website and can be downloaded for free. You are one click away from obtaining all that you need to score well in IB ESS SL.

The material made available on Tychr’s website is available for all IBDP subjects and is specially curated after an extensive amount of effort to ensure that the notes are in consonance with the IB curriculum and are an amalgamation from various textbooks prescribed by the IBO. Students often face a challenge understanding concepts, especially concepts that are new and tricky, these IB ESS Notes will help the student cover the chapter of Ecosystems and Ecology entirely while explaining every concept in a detailed and easy way.

The chapter on Ecosystems and Ecology discusses specific environmental terms like species, habitats, niche, population, biotic and abiotic factors. This is followed by an explanation on different forms of interactions amongst the population ranging from predation, herbivory, parasitism mutualism and disease. We also discuss the aspect of competition amongst the species for survival and the population growth curves. The feeding relationships amongst producers, consumers and decomposers are examined. The chapter also gives a brief insight of the various trophic levels and food chains.

Next, we talk about productivity in detail. Another important aspect that the chapter covers is carbon cycles and nitrogen cycles and the effect of human activities on the flow of energy and matter within these cycles. We also learn about the factors that affect the distribution of biomes and the process of zonation and succession. We understand the categorization of species into R and K strategist species followed by their survivorship curves.  The effect that climate change has on the distribution of biomes, particularly the impact of human activities on succession is explained.

The end of the chapter discusses the various ways of measuring the abiotic and biotic factors or components of an ecosystem to find out species diversity through Simpson’s diversity index.