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Living Things - Levels 5 - 7
[ Answers ] |
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| Jane carried out some experiments with food. She wanted to find out if cream crackers contain as much energy as peanuts. She used the equipment shown below.
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State two things Jane must do in her experiment to make it a fair test.
1. _____________________________
2. _____________________________
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Suggest a safety precaution that Jane should take.
The table shows information printed on a packet of peanuts and a packet of cream crackers.
| | Energy in kJ. | Protein in g. | Carbohydrate in g. | Fat in g. | Fibre in g. |
| 100g. of cream crackers | 2156 | 9.1 | 62.4 | 25.4 | 4.8 |
| 100g. of peanuts | 2411 | 28.8 | 12.9 | 46.0 | 7.2 |
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Jane burns 2g. of cream cracker under the beaker of water and then repeats the test with 2g. of peanut. Which test will give the greatest change in temperature of the water?
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Use the information in the table to explain why peanuts are good emergency rations for a hiking expedition.
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Peanuts do not contain vitamin C. Underline the best source of vitamin C. meat cheese oranges fish
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Fibre does contain energy but our bodies cannot use it. Explain why.
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Why is fibre an essential part of our diet?
Air is a mixture of gases. It contains nitrogen, oxygen, water vapour, noble gases and carbon dioxide.
The air we breathe in (inhaled air) and the air we breathe out (exhaled air) are different. List three differences in the composition of inhaled and exhaled air.
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Compared to inhaled air, exhaled air contains:
a) _____________________________
b) _____________________________
c) _____________________________
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Name the tube that connect the mouth to the lungs
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The walls of this tube are stiffened with 'rings' of cartilage. Why is this so?
This is part of the complex food web in a forest. 
Basing your answers on this information only:
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Name one top carnivore and one herbivore.
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The squirrels were damaging buds on the trees and the forest manager decided to shoot them. Giving reasons for your answers say how this might affect:
(i) the number of foxes?
(ii) the number of mice?
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In a year, a sparrow hawk may eat 150 small birds. This is a mass of well over 2kg of meat, yet a sparrow hawk only weights about 0.5kg. Explain why most of the energy from the bodies of the small birds does not remain in the sparrow hawk?
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Copyright©1998 - British Telecommunications plc |
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Last modified on: Tuesday, June 9, 1998.
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