Calculate mean value X - AQA - GCSE Biology - Question 7 - 2020 - Paper 1
Question 7
Calculate mean value X.
X = ___ cm³/hour
Draw a ring around the anomalous result in Table 3.
Suggest one possible cause of the anomalous result.
How did the stud... show full transcript
Worked Solution & Example Answer:Calculate mean value X - AQA - GCSE Biology - Question 7 - 2020 - Paper 1
Step 1
Calculate mean value X.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To calculate the mean value X, sum the values from Table 3 and divide by the total number of measurements. For example, if the values are 18.5, 19.3, and 19.5:
X=3(18.5+19.3+19.5)
This calculation yields:
X=357.3=19.1cm3/hour.
Step 2
Draw a ring around the anomalous result in Table 3.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Anomalous results can often be identified visually. In this case, you should highlight the value of 14.2 cm³/hour on the table as it deviates significantly from other results.
Step 3
Suggest one possible cause of the anomalous result.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
One possible cause for the anomalous result could be that there was a measurement error due to scale misreading or air bubbles in the measuring apparatus, which can lead to inaccurate volume readings.
Step 4
How did the students deal with the anomalous result?
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The students dealt with the anomalous result by not including it in their calculation of the mean value, ensuring their results reflect reliable data.
Step 5
Give one factor the students should have kept constant in this investigation.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
One factor the students should have kept constant is the light intensity; this ensures that variations in photosynthesis rates are due solely to temperature changes.
Step 6
Why did the rate of photosynthesis decrease from 35 °C to 45 °C?
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The rate of photosynthesis decreased from 35 °C to 45 °C likely due to enzyme denaturation. Enzymes that facilitate the photosynthesis process are sensitive to temperature; as the temperature rises, the enzymes may lose their active shape, reducing the rate at which reactions occur.
Step 7
Complete Figure 10 using data from Table 3.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
In Figure 10, label the y-axis as 'Rate of Photosynthesis (cm³/hour)'. Use an appropriate scale where each grid represents a specific interval. Plot the mean data points from temperatures 25 °C to 45 °C, marking each point accurately. Finally, draw a line of best fit to represent the trend of the data clearly.
