(e) noble gases
2 (a) glowing splint; (b) hydrogencarbonate; (c) lime water;
(d) cobalt chloride; (e) iodine solution
3 (a) fuel; (b) oxygen; (c) living cells; (d) oxygen;
(e) carbon dioxide; (f) water
4 (a) fuel; (b) oxygen; (c) high temperature; (d) go out
5 (a) photosynthesis; (b) oxygen; (c) water; (d) Light;
(e) chlorophyll; (f) starch; (g) by-product
6 (a) oxygen; (b) carbon dioxide; (c) air sacs; (d) breathing
Unbreathed air Breathed air
Nitrogen same same
Oxygen more less
Carbon dioxide less more
Water vapour less more
Labelled diagram
Nose
Trachea
Lung
Bronchus
Ribs
Intercostal muscle
Diaphragm
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