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3 (a) Carrots have different physical characteristics such as colour - Edexcel - GCSE Biology Combined Science - Question 3 - 2021 - Paper 1
Question 3
3 (a) Carrots have different physical characteristics such as colour. Which genetic term describes the physical characteristics of a carrot? A genotype B monohybri... show full transcript
Worked Solution & Example Answer:3 (a) Carrots have different physical characteristics such as colour - Edexcel - GCSE Biology Combined Science - Question 3 - 2021 - Paper 1
Step 1
Step 2
(i) Give one reason why the student used three carrot sticks instead of just one carrot stick.
Answer
Using three carrot sticks allows for more reliable results by accounting for variability in mass and ensuring that the data represents a broader sample rather than relying on a single measurement, which could be affected by anomalies.
Step 3
(ii) Give two ways that this method could be improved.
Answer
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Measure the length/width of the carrot sticks: This would help ensure that the carrot sticks are of similar size, potentially leading to more accurate results.
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Use the same variety of carrot: Ensuring that all carrot sticks are from the same variety could minimize genetic differences that might affect mass change.
Step 4
(iii) Calculate the percentage change in mass of carrot stick Q.
Answer
To find the percentage change in mass for carrot stick Q, we can use the formula provided:
ext{percentage change} = rac{ ext{change in mass}}{ ext{mass at the start}} imes 100Substituting the values for carrot Q:
- Change in mass =
- Mass at the start =
Calculating this gives:
ext{percentage change} = rac{0.8}{4.2} imes 100 = 19.05 ext{%}Rounded to 2 significant figures, the answer is 19%.
Step 5
(iv) Explain the change in mass of the carrot sticks.
Answer
The change in mass of the carrot sticks can be attributed to water movement. Carrot sticks gained mass due to water moving into the cells by osmosis. This process occurs when the carrot sticks are placed in distilled water, which is a hypotonic solution compared to the carrot cells, allowing water to diffuse into the sticks.