great question and answers for AQA GCSE Science

1. Diet and Exercise! ! ! ! ! 1
1 The metabolic rate of a person can sometimes affect whether a person is overweight or
underweight.
! 1 (a) (i) What is meant by metabolic rate? [1 mark]
! The rate/speed of all chemical reactions in the body. [1]
!! 1 (a) (ii) Some people have low metabolic rates.
! Suggest one thing a person can do to increase their metabolic rate. [1 mark]
Exercise or go on a diet or lose weight. [1]
!!!! Name one factor that affects metabolic rate that a person cannot change. [1 mark]
! Genes or DNA. [1]
! 1 (b) Some components of food are carbohydrates, proteins and fats. A balanced diet can
help a person maintain good health.
! Table 1 below shows the function of the above components of a diet.
! 1 (b) (i) Complete the table by adding a description of the function of each component. [3 marks]
! Table 1
!!!
!!!!
!
!
! 1 (b) (ii) Name one more component of a healthy diet not mentioned in Table 1. [1 mark]
! Vitamins or minerals or fibre or water. [1]
!! 1 (b) (iii) A person is malnourished if their diet is not balanced.
! Explain how a person can become malnourished as a result of an unbalanced diet.
[3 marks]
! Amount of energy or calories in food taken in or eaten [1]
is more than the energy used or needed by the body [1]
! Person gains weight or gets fat or overweight or obese [1]
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Component of Food Function in the Body
Carbohydrate
Energy supply [1]
Protein
For growth or to build new cells [1]
Fat
For stored energy [1]
Increase in proportion of muscle mass to fat would also increase
overall metabolic rate.
Fat also helps to insulate the body and protect some organs. Stored energy is the safest answer but
insulation will also get you a mark. Proteins also make enzymes and some hormones.

2. Diet and Exercise! ! ! ! ! 2
! or
! Amount of energy or calories in food taken in or eaten [1]
! is less than the energy used or needed by the body [1]
! Person loses weight or becomes underweight or too thin [1]
!!!!!!! 1 (c) A slimming programme called Dropweight claims to help with weight loss. The extract
below is taken from an advert promoting the programme:
‘The Dropweight programme is the best way to lose weight quickly. Over 90% of people
who took part in the programme reported loss of weight in one day’.
! Suggest why this extract might be misleading to member of the public who want to lose
weight. [2 marks]
! Any two from:
! Doesn’t tell you about weight loss over long term or that one day is too short to
measure weight loss.
! Doesn't tell you how many people were in the experiment or the sample size.
! Might not be the best way. / What evidence is there that it is the best way?
! Weight loss in one day could be due to other factors.
Not enough data/measurements of weight.
!
!!!!!! End
! [Total marks 12]
!!!!!!!!!!
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Malnutrition can lead to being overweight as well as being underweight. Not having enough of the
right vitamins and minerals can lead to getting a deficiency disease . Remember, you don’t need to
know the names of any deficiency diseases.
‘Suggest’ questions are there to test your
understanding in a broader way, but the plus
side is that there are usually many possible
answers.