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73 1 single wastes reproducing small volume diffusion

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7.31• single • wastes • reproducing • small • volume • diffusion• organelles • transport • larger • specialised •organs • alive21:5, 2:4, 3:1, 4:6, 5:2, 6:33a)It acts as a protective barrier for our bodies.b)Skin cells are programmed to die when they reach the outer most layer ofskin. Here the dead cells form a thin, scaly mesh that is water-proof andacts as a barrier to microbes from entering the body.4a)Around 3.8 billion years ago (bya)b)More than 30 timesc)It allows increased organism size; internal parts have protection fromouter cellsincluding reproductive cells; parts of the organism can diewhile the rest of the organism survives.d)To fulfil specific functions that suit their position relative to the other cellse.g. outside cells tend to have a role as a protective barrier.
Blitzing Biology 11Sample Answers© Blitzing Publications22Chapter 8SectionActivitySample answers8.11Across:1.Light4.Leaf6.ATP10. Respiration12. Glucose13. Chlorophyll14. Water15. Anaerobic17. Starch18. Oxygen19. Carbon dioxide20. Carbon dioxideDown:2.Heterotroph3.Water5.Autotroph7.Plant8.Chloroplast9.Mitochondria11.Photosynthesis16.Oxygen8.31SaltsInorganicNa+Help nerves to functionCarbohydratesOrganicSugars, pastasUsed for energyLipidsOrganicFats, oilsEnergy storage, cell membranes, insulationProteinsOrganicMeats, eggsGrowth and repairVitaminsOrganicB groupHelp enzymes function, regulate cellactivities, assist metabolism and growth2Sugar is very important for having energy as an organism. However, manyother substances are derived from foods that are not sugars and are essentialfor the healthy functioning of an organism. For example, fats in food areuseful for energy storage and vitamins are needed to allow enzymes tofunction correctly.8.41a)Our digestive system from the mouth to the anus is like a donut hole, asfood passing through it is not part of the body, just as something in adonut hole is not inside the donut itself.b)Water, mucous, and the enzyme amylase.c)Help churn the food.d)Hydrochloric acid creates an acid environment to allow pepsin to startbreaking down proteins.e)Bile salts surround lipids to assist in breaking them down.f)They help break down different substances in food.g)Nutrients move by diffusion and active transport into the cells andcapillaries of the intestinal lining.h)Water is absorbed from waste and bacteria here help to release vitaminsfrom the food.i)In herbivores, the appendix helps to break down cellulose. However, inhumans, who eat much less cellulose in their diet, the appendix is notinvolved in digesting cellulose.
Blitzing Biology 11Sample Answers© Blitzing Publications23Chapter 8 [continued]SectionActivitySample answers8.42Clockwise from bottom left:• appendix • large intestine • gall bladder • liver• stomach • pancreas • small intestine • rectum3Mouth:Chemical: releases saliva containing enzymes, e.g. amylasePhysical: teeth cut/grind food, which increases its surface areaStomach:Chemical: releases acid and enzymes such as pepsinPhysical: muscles churn foodSmall intestine:Chemical: contains many different enzymes to break down food8.51a)Faecesb)It is eliminated as faeces.

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Term
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Photosynthesis, Blitzing Publications

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