QCAA - Study guides, Class notes & Summaries

QCAA ATAR Biology Questions and answers, rated A+ 10% - -Only ______ of the energy is transferred from one level to another. Energy is lost through: -heat -metabolic processes -waste (faeces) Abiotic factors - -Nonliving components of environment: -climate -temp -O2/CO2 conc -soli pH Abundance - -The number of individuals in each species acceleration phase - -When growth rate is faster because there are: -greater numbers of individuals to produce increasingly more offspring ac...

QCAA chemistry Questions and answers, rated A+ acid-base indicator - -a chemical dye whose colour is affected by acidic and basic solutions Acids are - -proton (H+) donors activation energy - -the minimum amount of energy required to start a chemical reaction Addition of potassium dichromate(VI) solution acidified with dilute sulphuric acid to primary, secondary and tertiary alcohols will see a colour change for which (after heating)? - -primary and secondary alcohols. No change for te...

QCAA ATAR BIOLOGY UNIT 3 Questions and answers, VERIFIED/ Ecosystems - -a biological community of interacting organisms and their physical environments Limiting factor - -any biotic or abiotic factor that restricts the existence of organisms in a specific environment. examples include: the amount of water, amount of food, temperature, amount of space and availability of mates Hierarchical classification - -Arranging things into groups according to their similarities from larger genera...

QCAA Biology Unit 3&4 Questions and answers, graded A+ Carrying Capacity definition - -the size of the population that can be supported undefinedly on the available resources and services of that ecosystem. Polygenetic Inheritance definition - -when one characteristics is controlled by 2 or more genes Keystone species definition - -a plant or animal that plays a unique and crucial role in the way an ecosystem functions gene definition - -region/s of DNA that are made up of nucleotides;...

BIOLOGY UNIT 3 AND 4 QCAA. Exam Review Questions and answers, rated A+ Explain how environmental factors limit the distribution and abundance of species in an ecosystem. Limiting factors are aspects of the environment that restrict an organism's ability to live there. Limiting factors can be biotic, such as species interactions, food, and water or abiotic, such as light intensity, and climate. The distribution of species is limited by their ability to access adequate food sources and ...

UNIT 3 - QCAA Exam questions and answers, rated A+ 3.1.1.a - recognise that biodiversity includes - -the diversity of species, habitats and ecosystems. 3.1.1.b - determine diversity of species using measures such as species evenness (relative species abundance) which is a measure of - -the population size of a particular species relative to the population size of other species within the community 3.1.1.b - determine diversity of species using measures such as species percentage cover w...

QCAA Biology Unit 1 and 2 Exam Questions and answers, rated A+ explain, using an example, how the arrangement of internal membranes can control biochemical processes - -- the inner membrane folds and creases itself to expand then amount of surface area it has - this is called the cristae - this means there is a greater area for enzymes to work and cause reactions explain how biochemical processes are controlled and regulated - -- enzymes are catalysts - enzymes are proteins folded and ...

QCAA Biology Unit 3 Exam Questions and answers, rated A+ What is biodiversity? - -The variety of living organisms in a particular habitat. Built from species, genetic diversity and an ecosystem. How do you determine diversity using species richness? - -Count the number of organisms that belong to the species. What is species evenness/species abundance? - -Amount of species within a particular area What is percentage cover? - -Area covered by a species. What is percentage frequency? - ...