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Question Answer
Which nutrient is found in bread, pasta and rice? carbohydrates
Obesity is caused by…? eating too much
Starvation is caused by? not eating enough
What can a deficiency in vitamin A cause? blindness
anaemia is caused by a deficiency of..? iron
Name 3 nutrients and their uses Any of the following:carbohydrates – provides energyprotein – growth and repairfats/lipids – providesminerals – maintain health (calcium,iron)vitamins – maintain healthfibre – keeps food moving through the gut
what is the correct unit of energy? joules
what part of the earth is liquid? outer core
what is the core made from? iron and nickel
the only sources of the resources that humans need are..? crust, atmosphere, ocean
how much nitrogen is the atmosphere made up of? 78
how are igneous rocks formed? when molten rock cools and solidifies
how are sedimentary rocks formed? when broken remains of rocks join together
how are metamorphic rocks formed? when other rocks change because of heat and pressure
what is power? the rate as which energy is used
how many joules are in a kilojoule? 1000
what is mainly absorbed in the large intestine? water
where is most digested food absorbed? small intestine
what is photosynthesis? the process in which plants make their own food
what are the 4 things needed for photosynthesis? light, chlorophyll, carbon dioxide, water
what are the products of photosynthesis? glucose,oxygen
what is the word equation for photosynthesis? carbon dioxide + water = glucose + oxygen
what part of the plant cell does photosynthesis take place in? Photosynthesis takes place inside plant cells in small objects called chloroplasts. Chloroplasts contain a green substance called chlorophyll. This absorbs the light energy needed to make photosynthesis happen
true or false – photosynthesis cant take place at any time false – only in the light
how do plants get the things needed for photosynthesis? Plants get carbon dioxide from the air through their leaves, and water from the ground through their roots. Light energy comes from the Sun. chlorophyll is in the cell
how are the products of photosynthesis released? The oxygen produced is released into the air from the leaves. The glucose produced can be turned into other substances, such as starch and plant oils, which are used as an energy store.
when do plants respire? during the day and night
what are the cells at the top of the leaf called? palisade cells
how are root hair cells adapted? huge surface area
what do stomata do? Stomata allow carbon dioxide to diffuse into leaves.
what is the unit for power? watts (W)
1kw = ? 1000w
A 2 kW electric fire is used for 3 hours. Calculate the energy used in kWh. 6kwh
what does kwh stand for? kilo watts per hour
what is only present in plant cells and not animal cells? cell wall, vacuole, chloroplasts
what is the job of the nucleus? to control what happens inside the cell
what is the job of the cell wall? to give a plant cell its shape
what is the job of the cell membrane? to control what substances go in and out of the cell
what is a species? A species is a category within the classification system. Living things of the same type belong to the same species. For example, humans are one species and dogs are another species.
What is variation? The presence of differences between living things of the same species is called variation.
is weight continuous variation or discontinuous variation? continuous
boys and girls belong to the same…? species
what does corrosive mean? Able to damage metal, stonework, clothes and skin. Strong acids and alkalis are corrosive.
what is a base? A base is a substance that can react with acids and neutralise them. Bases are usually:
true or false – all alkilis are bases true
What name is given to a hazardous substance that can burn through skin and other substances? corrosive
whats an indicator? A substance that has different colours, depending upon the pH of the solution it is in.
What colour does litmus indicator trun in neutral,acidic and alkaline solutions? Litmus indicator solution turns red in acidic solutions and blue in alkaline solutions. It turns purple in neutral solutions.
what values on the ph sccale do neutral,acidic and alkaline solutions turn? neutral solutions are pH 7 exactlyacidic solutions have pH values less than 7alkaline solutions have pH values more than 7
What is the unit of force? N (newtons)
What is a force? a push or a pull
How can forces change an object? its speed, its shape and its direction of movement
How can you measure forces? newton meter, force meter
what is upthrust? Upwards force exerted by a liquid or gas on an object floating in it.
What is air resistance? A force of friction produced when an object moves through the air.
What is the control variable? the things you keep the same
What is the independent variable? the thing you change
What is the dependent variable? the thing you measure
What is moment? A moment is a turning effect of a force
How do you find the moment? moment = force ? distance
What is pressure? Force exerted over an area.
How do you calculate the pressure? force / area
What is the unit of pressure? newtons per square meter
How do you work out average speed? distance over time
If two objects are moving in the same direction towards or away from each other how do you calculate their relative speed? fastest speed – slowest speed
if two Objects are moving in opposite directions towards, or away from, each other how do you find their relative speed? add the speeds together
What does a horizontal line in a distance speed time graph show? object is stationery
What goes on the x axis on a distance speed time graph? time
what happens if an atom gains or loses an electron? If an atom gains an electron, it becomes negatively charged.If an atom loses an electron, it becomes positively charged.
What are the two ends of a bar magnet called? north and south pole
Two like poles will… repel
two unlike poles will… attract
what charge are electrons? negative
what is current? the flow of charge
what is used to measure current? ammeter
what is potential difference? Potential difference is a measure of the difference in energy between two parts of a circuit.
how do you measure potential difference? voltmeter
What is a series circuit? a circuit where the components are all in one loop, the current is the same all through the circuit
what happens if one component in a series circuit breaks? all the other ones do
what is a parallel circuit? when all the components are connected in more than one loop
as you add more components to a circuit what happens to the resistance? it increases
how do you calculate resistance? resistance = potential difference ? current
how is an electromagnet different to a normal bar magnet? an electromagnet needs electricity and can be turned on and off
how can you increase the strength of an electromagnet? wrapping the coil around a piece of iron (such as an iron nail)adding more turns to the coilincreasing the current flowing through the coil
what is kinetic energy? Energy which an object possesses by being in motion
what is gravitational potential energy? the energy an object gets as it gets higher
what is biological weathering? the breaking down of rocks caused by animals or plants
what is chemical weathering? the breaking down of rocks became of chemicals
what is the difference between non renewable and renewable energy sources? non-renewable energy resources cannot be replaced once they are all used up renewable energy resources can be replaced, and will not run out
what is a greenhouse gas? The gases responsible for global warming
what is the law of reflection? angle of incidence = angle of reflection
What type of waves are light? transverse
why does light refract? because its speed changes
what is amplitude? the amplitude is the maximum height of the wave from its resting position – the greater the amplitude, the louder the sound
what is wavelength? the wavelength is the distance between the crests (tops) of two waves next to each other (or any other two identical point on waves next to each other)
what is frequency? the frequency is the number of waves per second – the higher the frequency, the closer together the waves are and the higher the pitch
what is ultrasound? Sound with a frequency greater than 20,000 Hz
What type of waves are sound waves? longitudinal
what is superposition? When two waves meet and affect each other
what galaxy is the sun in? the milky way

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