Starting Unit 3 of QCE Biology but aren’t too familiar with what it’ll cover? Don’t stress — we’ve got you!
We’ll be breaking down what each of the topics you’ll study involve and equip you with the right guides to help you tackle your assessments for QCE Biology Unit 3.
So what are you waiting for? Let’s get started!
What is Unit 3 in QCE Biology all about?
Topic 1: Describing Biodiversity
Topic 2: Ecosystem Dynamics
QCE生物学单元3评估
Study Tips
What is Unit 3 in QCE Biology all about?
In Unit 3, there is a strong focus onconnection and how various components of an ecosystem interact with each other to allow for the effective functioning of communities of plants and animals.In particular, we are interested in concepts such as biodiversity, population dynamics, and how we classify and identify organisms.
The hope is thatthese newfound understandings of the structure of ecosystems will aid in the development of our knowledge on processes involving the movement and transformation of energy and matter throughout ecosystems.By the end of the unit, we should be able to appreciate the dynamics and diversity that provide the foundations of harmonious communities to arise!
The knowledge gained should beapplied in order to compare ecosystems across spatial and temporal scales by analysing and interpreting data.Our analyses should show insight into our understanding of the interconnectedness that allows for ecosystems to function.
A major context that should be investigated is that ofthe impact that humans have on the biosphere— particularly with regard to biodiversity and ecosystem management.
Topic 1: Describing Biodiversity
This topic is composed of two subtopics, and focusses on the concept of biodiversity (concerning both species and ecosystems). Additionally, it touches on多样性的不同度量以及各种因素如何影响多样性！
Biodiversity
Within this subtopic, you will发展您对生物多样性的理解，以及这不仅与物种以及整个生态系统联系在一起。You will learn how to implement different measures of species diversity, including:
- Species richness
- Relative species abundance
- Percentage cover and frequency
- Simpson’s Diversity Index
The formula for Simpson’s Diversity Index, which you should become very familiar with using, is as follows:
SDI = 1 – ((Σn(n– 1))/N(N– 1))
These measures can then be used, along with your knowledge ofspecies interactions(i.e. predation, competition, symbiosis, disease), andabiotic factors, tocompare ecosystems across temporal (time) and spatial (location) scales.
It will also be important to考虑环境限制因素如何不仅影响物种的分布，而且会影响生态系统中的物种的丰富性. In topic two, you will also consider如何规范的因素调节人口大小吗ies.
关键要点
- Become familiar with the concept of biodiversity
- Understand and determine the measures of diversity and be able to use these measures in your analysis of data
- Understand how a number of factors influence the distribution of species in an ecosystem
Classification Processes
This subtopic is quite a content-heavy one. Firstly, itrequires you to describe various classification systems and recognise their key features(i.e., whether they are hierarchical in nature, or based on physical similarities/methods of reproduction/molecular sequences).
Notably,we are interested in the Linnaean system(which can be seen in the image below),无性恋人与性繁殖和K vs r-selection以及分子系统发育/cladistics。
Image sourced fromWoo! Jr
When looking at cladistics, it’s also important that you arefamiliar with what a clade is, as well as the three primary assumptions of cladistics.
You will also learn如何通过分子图和分子序列分析来确定个体的相关性。You will also be able toclassify organisms on the basis of their interactions— predation, competition, symbiosis, disease.
With regard to ecosystems,you will be able to recognise that they are composed of varied habitats— ranging from microhabitats all the way to ecoregions. You will also learn about themanagement of old-growth forests, productive soils and coral reefs, and the role that ecosystem classification playsin ensuring the management of these ecosystems is performed effectively.
Stratified samplingis also a process you will become familiar with during this topic.
关键要点
- Become familiar with both species and ecosystem classification systems
- Be able to analyse data to determine evolutionary relatedness
- Understand how ecosystem classification is important with regard to ecosystem management
- Familiarise yourself with the processes of stratified sampling
Topic 2: Ecosystem Dynamics
This topic is composed of three subtopics, and focusses onthe importance of interactions between organisms, as well as the environment, for the functioning of the ecosystem. Additionally, it has a focus onhow ecosystems develop and change over time, as well as how populations are regulated by environmental factors.
Functioning Ecosystems
This subtopic is related tothe transfer of energy and matter through an ecosystem, as well as interactions between organisms and how these interactions impact the functioning of an ecosystem!
You will learn abouthow biomass and energy flows through an ecosystem, through the trophic levels, and will be able to calculate energy transfers based on food chains/webs/pyramids.Additionally, you will develop a greater understanding of the water, carbon and nitrogen cycles.
Image sourced fromSocratic.org
您还将对ecological niches and how these play a role in the competitive exclusion principle.Additionally, you should become familiar with the idea of keystone species.
关键要点
- 了解整个生态系统的能量和物质转移和转变
- 能够计算能量传输
- Understand niches and their implications
- Understand the role of keystone species and predict the effect of their removal
Population Ecology
This subtopic is focussed onpopulation growth, as well as the factors impacting population size.For this, the key concept of interest is carrying capacities.
You should be able to解释生物和非生物因素如何影响生态系统的承载能力. You will learn toanalyse population growth datain order to determine whether the population growth is exponential or logistic.
Further, using birth, death, immigration and emigration data, you should be able to计算人口增长率。您还将了解林肯指数and how to use it to estimate population sizes:
N = (n1* n2）/m
关键要点
- Understand and explain the factors that limit and influence population growth
- Be able to estimate population sizes using the Lincoln Index and calculate population growth rates based on data
Changing Ecosystems
In this subtopic, we are interested in生态系统如何随着时间的流逝而发展。您将熟悉生态继承的概念，并了解其两种模式：primary and secondary succession.
When learning about primary succession, you will investigate the先锋物种的特性,允许他们坳onise bare ground.
You will also further develop your analytical skills byusing data to determine past ecosystem changes as well as predicting future ecosystem changes.
关键要点
- Understand that ecosystems change overtime and in response to a number of factors
- Analyse data to determine past change and predict future change
QCE生物学单元3评估
Within this unit, there aretwo types of assessments that you will need to complete.These are yourdata test and your student experiment!
Data Test
For the data test, they are more interested inyour ability to analyse data and trends — rather than whether or not you can regurgitate large chunks of information.几乎每个问题的答案都会在您面前的页面上，这取决于您识别它。
Get a head start on this assessment by checking out ourpractice data test questions这里!
Student Experiment
For the student experiment, you will need to startlinking your newfound analytical skills to the theory you have been learning.You can think of this as a slightly longer data test, where you are only focussed on one, maybe two, sets of data.
For guidance on how to ace this task, check out our编写学生实验的指南这里！
Tips for Study
The biggest tip for studying Biology is tomind-map everything!All the content you will learn across Units 3 & 4 are connected. Finding these connections makes memorisation so much easier.
We’ve got a number of tips inthis article on how to ace your external examthat should be implemented throughout the entire year to give yourself the greatest chance at success!
Are you looking for some extra help with revising QCE Biology Unit 3?
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Katelyn Smithwas a pioneer in the Queensland ATAR system. After graduating in 2020 with an ATAR of 98.40, she now studies a Bachelor of Advanced Science (Honours) at The University of Queensland — majoring in Physics. Through her studies, she hopes to develop a greater appreciation for how the wonders of the universe work. When she isn’t slaving away behind her unnecessarily large textbooks, she enjoys catching up with friends, scrolling mindlessly through TikTok, and sleeping.
