food tests and energy
TRANSCRIPT
Food tests and energyQuestion Paper 3
Level GCSESubject BiologyExam Board CCEATopic Nutrition and food testsSub-Topic
Booklet Question Paper
56 minutes
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Food tests and energy
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Higher Tier
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1 (a) The graph shows how the average daily energy requirement, of 15 to 50 year old males and females, varies with age.
7000
8000
9000
10 000
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12 000
15–18Age/years
19–50
Key
Male
Female
Pregnant Female
Breast- feeding female
Aver
age
daily
ene
rgy
requ
irem
ent/k
J
(i) Describe and explain the difference in the average daily energy requirementof 15–18 year old males and females.
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(ii) Pregnancy increases a woman’s average daily energy requirement.
Calculate the percentage increase in the average daily energy requirementdue to pregnancy.Show your working.
_________________________ % [3]
(iii) Explain why pregnancy increases a woman’s average daily energyrequirement.
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(iv) Give one factor, not shown in the graph, which affects a person’s averagedaily energy requirement.
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(b) The graphs show the percentage of men of different ages in each BMI categoryin 1993 and 2004.
Per
cent
age
of m
en in
eac
h B
MI c
ateg
ory/
%
16–24 25–34 35–44 45–54 55–64 65–74 75+Age/years
1993100
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10
0
Per
cent
age
of m
en in
eac
h B
MI c
ateg
ory/
%
16–24 25–34 35–44 45–54 55–64 65–74 75+Age/years
2004100
90
80
70
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50
40
30
20
10
0
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A person with a BMI of 30 and above is described as obese.
(i) Describe the relationship between age and obesity levels in 1993.
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(ii) Calculate the change in the percentage of men aged 55–64 who wereobese in the eleven years between 1993 and 2004.
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(iii) Use this trend to predict what percentage of men aged 55–64 will be obeseeleven years later, in 2015.
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(iv) Predictions of future obesity levels in men can be unreliable.
Use the data for 45–54 year old men in 2004 to suggest why.
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(c) Obesity is estimated to cost the Northern Ireland economy £500 million per year.
Give two ways obesity costs the local economy.
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2 The table shows the results of food tests carried out on a biscuit.
Test reagent Reagent colour at start Result of food test
Benedict’s blue positive
Ethanol clear positive
Biuret blue negative
Iodine yellow/brown positive
Look at the table.
Use the information in the table to draw conclusions about the types of food in the biscuit.
Describe the colour change for each food test.
In this question you will be assessed on your written communication skills, including the use of specialist scientific terms.
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© CCEA
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3 The table shows the loss of vitamin C content of four types of salad leaves stored for 10 days after picking.
Type of salad leaf
Vitamin C content per 100 g of salad leaves/mg Percentage loss
of vitamin CDay 0 Day 10
Green lettuce 0.10 0.09
Wild rocket 72.97 3.55 95.10
Lamb’s lettuce 59.18 13.61 77.00
Red lettuce 0.07 0.07 0.00
Look at the table.
(a) Calculate the percentage loss of vitamin C content in green lettuce.
Show your working.
Write your answer in the table. [2]
(b) Use data from the table to explain which type of salad leaf is mostsuitable for use after storing for 10 days.
[2]
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(c) A bag of fresh mixed salad leaves has a vitamin C content of 20 mgper 100 g.
A portion of fresh salad leaves weighs 60 g.
(i) Calculate the mass of vitamin C in a 60 g portion of fresh mixedsalad leaves.
Show your working.
Mass mg [1]
An adult is advised to have a daily intake of 50 mg of vitamin C.
(ii) What percentage of their daily vitamin C is provided by thisportion of fresh mixed salad leaves?
Show your working.
Percentage [1]
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4 The table shows measurements of three men, Ajay, Michael and Rory made during a health check.
Name Height/m Mass/kg
Ajay 1.55 63.6
Michael 1.75 81.8
Rory 1.60 81.8
The chart shows the Body Mass Index (BMI) values for men of different heights and masses.
Use the measurements of Ajay, Michael and Rory in the table and data from the chart to compare the BMI of the three men.
(a) Which man is obese?
Use evidence from the chart to support your answer.
[2]
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(b) Another man, Darren, was found to be overweight.
He was advised to reduce his body mass by walking for 1 hour eachday instead of watching television for 1 hour.
Walking for 1 hour uses 1090 joules of energy.
The energy required to reduce body mass by 1 kg is 32 700 joules.
Watching television for 1 hour each day uses 32 700 joules in 93 days.
(i) Calculate how much quicker Darren could reduce his bodymass by 1 kg if he walks for 1 hour each day instead of watchingtelevision.
Show your working.
Number of days less [3]
Once Darren reduces his body mass by the amount advised his BMI will be below 25.
(ii) Suggest what he should do to keep his BMI at 25 and so maintainhis ideal mass.
[2]
(c) Give two other factors that affect the daily energy requirement of aperson.
1.
2. [2]
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5 (a) Name two chemical elements found in all food molecules.
[1]
(b) Complete the table about components of the diet.
Component Example Source Function
Carbohydrate Lactose Energy [1]
D MilkGrowth of bones and
teeth[1]
Mineral Red meatNeeded for
haemoglobin in red blood cells
[1]
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6 Food labelling helps people make healthy food choices.
The label shown below is from a pizza box.
SERVES 2 - HALF PIZZA PROVIDES
ENERGY480 kcal
10%
SUGAR9.0 g
26%
FAT18.3 g
33%
SALT2.0 g
SATURATED FAT9.2 g
46%
OF YOUR RECOMMENDED DAILY AMOUNT (RDA)
The recommended daily amount (RDA) of energy required for a woman is 2000 kcal.
(a) (i) Complete the label for energy by calculating the percentage of awoman’s RDA provided by this half pizza.Show your working.
Reproduced by kind permission of the Department of Health, © 2014
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The half pizza provides a man with 19% of his RDA for energy.
(ii) Explain why the half pizza provides a man with a lowerpercentage of his RDA than it does for a woman.
[2]
(b) Give two factors, other than age and gender, which would affect theRDA of energy needed by a person.
[1]
[1]
(c) Eating a whole pizza may be a risk to health.Use the information in the label about the saturated fat content tosuggest why.
[2]
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