AS Biology unit 2 Food questsion and answers

HideShow resource information
Preview of AS Biology unit 2 Food questsion and answers

First 216 words of the document:

1. Over the last few years there has been much public concern over the diet of people in
the UK and its effects upon their weight and health.
Body Mass Index is a calculation used by doctors to indicate whether a person is
underweight or overweight.
(a) State the medical term used to describe a person whose Body Mass Index is
greater than 30.
.........................................................................................................................
[1]
The table below shows the daily intake of certain components in three diets,
A, B and C for men in the UK.
Diet A · a normal balanced diet for a typical man
Diet B · a weight-reducing low fat diet
· restricted to avoid fats
· includes any fruit, vegetables and proteins
· energy intake is monitored carefully
Diet C · a weight-reducing low carbohydrate diet
· restricted to avoid carbohydrates
· excludes fruit as these contain sugars
· includes any non-starchy vegetables, proteins and fats
· energy intake is not counted and may exceed 10 000 kJ
on some days
Diet A Diet B Diet C
normal balanced weight-reducing weight-reducing
diet low fat diet low carbohydrate
diet
energy / kJ 9720 6000 8000
fats / g 87 34 124
carbohydrates / g 275 200 20
proteins / g 88 76 165
combined
12 12 18
minerals / g
SWAKELEYS SCHOOL 1

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

In any unbalanced diet it is possible that there may be a deficiency of certain
nutrients.
Suggest one nutrient that may be deficient in diet B and one in diet C.
Diet B ..............................................................................................................
Diet C ..............................................................................................................
[2]
(c) (i) Explain which diet, B or C, is likely to cause more rapid weight loss.
................................................................................................................
................................................................................................................
................................................................................................................
................................................................................................................
[2]
(ii) State the relationship between energy intake and energy use that would
allow a person to lose weight.
................................................................................................................…read more

Page 3

Preview of page 3

Here's a taster:

Doctors suggested that diet C may not be very healthy in the long term, as it
contains unlimited amounts of fats and no fruit.
Suggest what potential health problems, other than continued weight loss,
might result in a person who kept to a low carbohydrate diet, similar to diet C.
.........................................................................................................................
.........................................................................................................................
.........................................................................................................................
.........................................................................................................................
.........................................................................................................................
.........................................................................................................................
[3]
[Total 9 marks]
2.…read more

Page 4

Preview of page 4

Here's a taster:

R vitamin C deficiency unless qualified
raised, cholesterol/LDL, levels in blood; R intake
fatty substances deposited in artery walls/atherosclerosis;
coronary arteries;
narrows lumen;
reduces, blood/oxygen, delivered to heart muscle;
CHD/heart attack/angina;
thrombosis/clot;
raised blood pressure/hypertension;
stroke;
stress on liver;
stress on kidney;
due to excess protein/amino acids/urea;
AVP;
AVP; e.g.…read more

Page 5

Preview of page 5

Here's a taster:

Read the following passage and complete each sentence by writing the most
appropriate word in the spaces provided.
Health can be defined as a state of complete ....................................., mental and social
well-being. It is not merely the absence of infirmity or ..................................... . Many people
may consider themselves healthy, even though they do not fully match the above criteria. A
young woman can improve her health in a number of ways.…read more

Page 6

Preview of page 6

Here's a taster:

The table below shows data from research investigating the presence of pesticide
(insecticide and herbicide) residues in drinking water in the UK from 1995 to 1998.
number of samples % of samples over
pesticide
analysed over 4 years safe limit for drinking
insecticide lindane 2227 0.7
DDT 1057 0.2
herbicide mecoprop 2281 27.9
atrazine 333 10.2
Data from Guide to a Green Planet, edited by Jules Pretty, pp.71 ­75, University of Essex, 2002
(a) DDT was banned from use in the UK in 1986.…read more

Page 7

Preview of page 7

Here's a taster:

AW;
builds up in food chains;
still used in other parts of the world; (and so can still enter ecosystems)
ref to global cycling;
AVP; max 2
(b) to remove weeds from crops to increase yield/AW;
ref to decreased competition (in crops)/AW;
quicker and cheaper (than using labourers);
ref to size of target species;
ref to specificity of insecticides/ora;
ref to validity of data in study/ref to comparative data;
AVP; max 3
[5]
7. Aphids are pest species which farmers control using insecticides.…read more

Page 8

Preview of page 8

Here's a taster:

Tau-fluvalinate;
less needed/ref to data with correct units; max 2
[2]
9. The effect of diet on cancer mortality is partly due to its effect on obesity. Obesity is
defined as having a Body Mass Index (BMI) over 24.9. BMI is calculated by the
following formula.
body mass kg
BMI =
height m
2
The figure below shows the effect of BMI on the relative risk of dying from cancer.
Non-obese people with a BMI of 18.5­24.9 are assigned a baseline risk of 1.
2.…read more

Page 9

Preview of page 9

Here's a taster:

Use the figure above to explain the likelihood of this woman dying from cancer.
.........................................................................................................................
.........................................................................................................................
.........................................................................................................................
.........................................................................................................................
[2]
[Total 4 marks]
10. (i) 105
(1.7)2; A 105/2.89
BMI = 36; A 36.3 or 36.33 2
(ii) BMI is 35 to 39.9; A ecf
relative risk of dying is 1.45; A number between 1.4 and 1.5
she is, 45%/nearly half as much again, more likely to die from
cancer than non-obese person; max 2
[4]
11.…read more

Page 10

Preview of page 10

Here's a taster:

Some amino acids are known as essential amino acids.
(i) State what is meant by the term essential amino acids.
................................................................................................................
................................................................................................................
[1]
(ii) Outline the functions of essential amino acids in the body.
................................................................................................................
................................................................................................................
................................................................................................................
................................................................................................................
[2]
(c) The photograph below shows a child with kwashiorkor, a form of protein energy
malnutrition.
Reproduced by kind permission of Tom D Thacher,
MD, www.thachers.…read more

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »