Term 1 & 2
Which layer of the Earth causes the movement of the plates?
Mantle
Define homeostasis
Finish this equation:
Hydrochloric Acid + Sodium Carbonate ->
Sodium Chloride + Water + Carbon Dioxide
How is an ion made?
Loss or gain of an electron
State the correct steps in the Stimulus-Response Model
Stimulus -> Receptor -> Control Centre -> Effector -> Response
The bending of a ray of light when it enters another medium is called:
Refraction
What is three features of a reflex action?
Rapid
Without concious thought
Protective
What is activation energy?
Energy required to activate a reaction
What is the law of conservation of mass?
Do all isotopes amit radiation?
No
Sound level
What is the 2nd line of defence?
Inflammation around the area
Describes alpha radiation
Positive charge with low penetration
What is the difference between a pathogen and microbe?
Microbes that cause disease are called pathogens. It is important to remember that: A pathogen is a micro-organism that has the potential to cause disease.
Draw and label a neuron
Explain why energy is lost in each step of a food chain
Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level
How does Insulin work to lower blood glucose levels?
Glucose to be taken up by skeletal muscles
Converted into fat for storage in tissues
Glucose production to cease in liver (gluconeogenesis)
What is a radioisotope?
One that is unstable and releases radiation
Chemical / Electrical
Long lasting / Short
Localised / Specific
43
A
15
How many protons / neutrons / electrons does this atom have?
15 / 28 / 15
What is the difference between parallel and series circuits?
In a series circuit, all components are connected end-to-end, forming a single path for electrons to flow. In a parallel circuit, all components are connected across each other, forming exactly two sets of electrically common points
What is the function of adrenaline and the effects it has on the human body?
Adrenaline is hormone released when flight or fight response is enabled. It affects the body by:
Increased heart rate
Dilation of airways
Pupil dilate
Increase blood flow to muscles
Slowing down of non-essential functions
Increase glucose production
Balance this equation:
Al + HCl → AlCl3 + H2
2Al + 6HCl → 2AlCl3 + 3H2
Name and describe three types of error.
Systematic errors come from identifiable sources. The results caused by systematic errors will always be either too high or too low.
Random errors are the result of unpredictable changes. Unlike systematic errors, random errors will cause varying results
Human errors are a nice way of saying carelessness.
Name and describe the three types of sampling.
Stratified sampling involves breaking the population into 'strati or groups based on characteristics they share
Random sampling employs a carefully planned and systematic method of selecting participants for a study
Convenience sampling, as its name suggests, is a very easy way of selecting participants. It involves selection of participants based on easy accessibility or availability.