1. advantagedisadvantage Organic intensive FARMING What are the advantages and disadvantages of the 2 methods of farming: AdditiveReason C_________To make food look attractive F_________Improve taste S_________Sweeten without adding sugar E_________To mix together ingredients that would normally separate P_________To prevent microbes growing A_________To prevent fats and oils reacting with oxygen DIGESTION E______ breakdown large molecules into smaller molecules that can be absorbed into the b______. Any excess a_____ a_____ are broken down in the l______ and excreted in u______. FOOD SAFETY F_____ S______ A______ are a government agency which aim to make sure food is 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 – FOOD MATTERS

2. B3 - Life on Earth Causes of extinction: increased c_______ New p________ e_________ change new d_________ SELECTIVE BREEDING What is selective breeding? How does it differ from natural selection? D______ proposed the theory of e______ to explain how species change over time. There is v_______ between individuals, those that are better a_______ are more likely to s________ and r________, passing on favorable characteristics. NATURAL SELECTION COMMUNICATION SYSTEMS NervesHormones Speed of response Chemical or electrical How is it carried? HUMAN EVOLUTION How are human beings different from apes? bigger b_____ w_____ upright EXTINCTION EVOLUTION LAMARCK Believed that acquired characteristic s can be inherited What resources are plants and animals in competition for? EVIDENCE What evidence is there that evolution is happening?

3. P3 – Radioactive Materials Helium atom Label the parts of the atom: P____ E_____ N_____ BACKGROUND RADIATION Where does background variation come from? ______________________ ______________________ Type of radiation SymbolStopped by.... Ionizing power (strong/poor /medium) α β γ Complete the table: TYPES OF RADIATIONATOMS GENERATING ELECTRICITY Label the parts of a power station: 1.______________ 2.______________ 3.______________ 4.______________ Energy SourceAdvantageDisadvantage RENEWABLE ENERGY Come up with 3 renewable sources of energy which are alternatives to fossil fuels or nuclear power... Radioactive atoms are u_____ and decay emitting radiation. R______ d____ helps atoms to become more stable. As a radioactive atom decay its activity drops. H____ l_____ is the time it takes for radioactivity to halve, different substances have different h____ l_____. HALF-LIFE USES OF RADIOACTIVITY Give some examples of the uses of radioactivity: ________________ ________________ ________________ ________________ NUCLEAR FISSION (Higher only) N_____ f_____ takes place in the nucleus of the a_____. A n______ is absorbed by a uranium nucleus. The nucleus is split releasing e______. A c_____ r______ can be started releasing further energy.