GCSE Edexcel Biology: Combined Science Circulatory system- blood: 1 (a) Pathogens cause disease.

Question

1 (a) Pathogens cause disease.

Draw one straight line from each type of pathogen to the disease that is caused by that pathogen.

| type of pathogen | disease |
| ---------------- | ------- |
| fungus           | AIDS   |
| virus            | malaria |
|                  | tuberculosis |
|                  | cholera |
|                  | Chalara ash dieback |

(b) Antibiotics can be used to treat diseases.

Antibiotics kill

- A antibodies
- B antigens
- C bacteria
- D viruses

(c) Figure 1 shows the number of white blood cells in blood samples from three patients.

| Number of white blood cells per µl |
|------------------------------------|
| Patient X | 8500 |
| Patient Y | 5700 |
| Patient Z | 12500 |

Figure 1

Explain why the data suggests that Patient Z has a bacterial infection.

(d) HIV is diagnosed by blood tests.

State two safety precautions that need to be taken when handling blood samples.

1.
2.

1 (a) Pathogens cause disease - Edexcel - GCSE Biology: Combined Science - Question 1 - 2018 - Paper 1

Worked Solution & Example Answer:1 (a) Pathogens cause disease - Edexcel - GCSE Biology: Combined Science - Question 1 - 2018 - Paper 1

Pathogen: fungus

Pathogen: virus

Explain why the data suggests that Patient Z has a bacterial infection.

State two safety precautions that need to be taken when handling blood samples.

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