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 word that describes an organism that causes disease is a pathogen. Pathogens are microorganisms that can lead to illnesses in humans, animals, and plants.
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 the disease is spread is in water.
For malaria, the main way the disease is spread is 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
Plot the following points on Figure 2 for the bacteria at 10°C:
(0, 10)
(2, 47)
(4, 80)
(6, 90)
Ensure accuracy within one small square when plotting.
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
Draw a straight line that best represents the trend through all the plotted points while ignoring any extrapolations. Ensure the line is smooth and does not necessarily pass through every point.
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
The growth of bacteria at 10°C is slower than the growth at 20°C. Specifically, the increase in the number of bacteria at 10°C is linear and does not level off, showing a consistent growth pattern. In contrast, the growth at 20°C is more rapid, resulting in a higher number of bacteria overall.
