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advantage disadvantage
Organic
intensive
FARMING
What are the advantages anddisadvantages of the 2 methods offarming:
Additive Reason
C_________ To make food look attractive
F_________ Improve taste
S_________ Sweeten without adding sugar
E_________ To mix together ingredients that wouldnormally separate
P_________ To prevent microbes growing
A_________ To prevent fats and oils reacting withoxygen
DIGESTION
E______ breakdown largemolecules into smaller moleculesthat can be absorbed into theb______. Any excess a_____a_____ are broken down in the
l______ and excreted inu______.
FOOD SAFETY
F_____ S______ A______are a government agencywhich aim to make sure foodis safe , healthy and fairly
marketed.
Why can nitrogen be lost from the soil as a result of intensive farming?
How do farmers overcome the problem?
C3 h FOOD MATTERS
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B3 - Life on Eart
Causes of extinction: increased c_______
New p________ e_________ change
new d_________
SELECTIVE BREEDINGWhat is selective breeding?
How does it differ from natural selection?
D______ proposed the theory ofe______ to explain how specieschange over time. There isv_______ between individuals,those that are better a_______
are more likely to s________ andr________, passing on favorablecharacteristics.
NATURAL SELECTION
COMMUNICATIONSYSTEMS
Nerves Hormones
Speed ofresponse
Chemical orelectrical
How is itcarried?
HUMAN EVOLUTION
How are human beingsdifferent from apes? bigger b_____
w_____ upright
EXTINCTION
EVOLUTION
LAMARCKBelieved thatacquired
characteristics can beinherited
What resources areplants and animals incompetition for?
EVIDENCE
What evidence is there thatevolution is happening?
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P3 h Radioactive Materials
Helium atom
Label the parts ofthe atom:
P____
E_____
N_____
BACKGROUND RADIATIONWhere does backgroundvariation come from?
______________________
__________________________________________________________________
Type ofradiation
Symbol Stoppedby....
Ionizingpower(strong/poor/medium)
Complete the table:
TYPES OF RADIATIONATOMS
GENERATING ELECTRICITY
Label the parts of a power station:
1. ______________2. ______________
3. ______________4. ______________
Energy Source Advantage Disadvantage
RENEWABLE ENERGY
Come up with 3 renewable sources of energy whichare alternatives to fossil fuels or nuclear power...
Radioactive atoms are u_____and decay emitting radiation.R______ d____ helps atomsto become more stable. As aradioactive atom decay itsactivity drops. H____ l_____is the time it takes for
radioactivity to halve,different substances havedifferent h____ l_____.
HALF-LIFE
USES OFRADIOACTIVITYGive some examplesof the uses ofradioactivity:
________________________________________________________________________________________________________________________________
NUCLEARFISSION
(Higher only)
N_____ f_____ takesplace in the nucleus ofthe a_____. A n______is absorbed by a uraniumnucleus. The nucleus issplit releasing e______.A c_____ r______ can
be started releasingfurther energy.