Some bacteria cause disease - Edexcel - GCSE Biology - Question 1 - 2022 - Paper 1
Question 1
Some bacteria cause disease.
(a) Which word describes an organism that causes disease?
(b) Draw one straight line from each disease to the main way that the diseas... show full transcript
Worked Solution & Example Answer:Some bacteria cause disease - Edexcel - GCSE Biology - Question 1 - 2022 - Paper 1
Step 1
Which word describes an organism that causes disease?
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
The correct word to describe an organism that causes disease is pathogen.
Step 2
Draw one straight line from each disease to the main way that the disease is spread.
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
For cholera, the main way it is spread is in water.
For malaria, it is spread by animal vectors.
Step 3
Plot the points on the graph for the number of bacteria at 10°C.
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
The points should be plotted accurately based on the data provided in Figure 1. Each point corresponds to the number of bacteria at each time interval.
Step 4
Draw a line of best fit on the graph for 10°C.
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
A straight line of best fit should be drawn through the plotted points, ensuring it represents the trend observed in the data at 10°C.
Step 5
Describe how the growth of bacteria at 10°C was different from the growth of bacteria at 20°C.
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
At 10°C, the growth of bacteria is slower than at 20°C. The growth curve is linear and does not level off, indicating that bacteria continue to multiply steadily over time. In contrast, at 20°C, bacteria show a more rapid growth rate.
