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The table shows the masses of two children, R and S, from birth to 18 months - Edexcel - GCSE Biology - Question 3 - 2018 - Paper 1
Question 3
The table shows the masses of two children, R and S, from birth to 18 months. | age in months | child R | child S | |---------------|---------|---------| | birth ... show full transcript
Worked Solution & Example Answer:The table shows the masses of two children, R and S, from birth to 18 months - Edexcel - GCSE Biology - Question 3 - 2018 - Paper 1
Step 1
Compare the growth of child R and child S from birth to 6 months.
Answer
From birth to 6 months, child R's mass increased from 3.3 kg to 7.1 kg, resulting in an increase of 3.8 kg. In contrast, child S's mass increased from 2.7 kg to 6.5 kg, a growth of 3.8 kg as well. However, child R has a higher weight at 6 months indicating faster growth. Additionally, child S has a lower birth mass, which contributes to its smaller size at 6 months. Furthermore, the percentage increase in mass from birth to 6 months for child S is greater, highlighting a faster growth rate relative to its initial weight.
Step 2
Calculate the percentage increase in mass for child S from 6 to 18 months.
Answer
To calculate the percentage increase for child S:
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The mass at 6 months is 6.5 kg and at 18 months is 8.8 kg.
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The increase in mass is: 8.8 kg - 6.5 kg = 2.3 kg.
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The percentage increase is calculated as follows:
ext{% increase} = \left( \frac{\text{increase}}{\text{original mass}} \right) \times 100
\text{% increase} = \left( \frac{2.3 \text{ kg}}{6.5 \text{ kg}} \right) \times 100 \approx 35.38\%
Step 3
Suggest a reason for the difference in the percentage increase in mass of child R and child S from 6 to 18 months.
Answer
The difference in the percentage increase in mass may be due to several factors such as genetics, diet, and overall metabolism. Child R could have a faster metabolism or be more physically active compared to child S, resulting in different growth patterns. Additionally, differences in diet and starting masses at birth could impact growth rates.