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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.