A botanical garden keeps 60 young cycads in a propagation house. Some plants have areas of decay on their leaves. Several plant diseases can cause this sign.

A team tested all 60 plants using a kit containing monoclonal antibodies for pathogen P. A positive result shows that pathogen P is present.

Visible decay on leaves	Positive test result	Negative test result
Present	18	12
Absent	4	26

Evaluate the claim that visible decay is a reliable way to identify plants infected with pathogen P.

Use data from the table in your answer.

Give one reason why the testing kit detects pathogen P but not other causes of decay.

The team relies only on visible decay for several days before using the testing kit.

Predict one consequence of this delay.

A botanical garden keeps 60 young cycads in a propagation house. Some plants have areas of decay on their leaves. Several plant diseases can cause this sign.

A team tested all 60 plants using a kit containing monoclonal antibodies for pathogen P. A positive result shows that pathogen P is present.

Visible decay on leaves	Positive test result	Negative test result
Present	18	12
Absent	4	26

Evaluate the claim that visible decay is a reliable way to identify plants infected with pathogen P.

Use data from the table in your answer.

Give one reason why the testing kit detects pathogen P but not other causes of decay.

The team relies only on visible decay for several days before using the testing kit.

Predict one consequence of this delay.

3.3 Plant disease

Question 13

Markscheme

3.3 Plant disease

Question 13

Markscheme

3.3 Plant disease

Question 13

3.3 Plant disease Questions

3.3 Plant disease

Question 13

3.3 Plant disease Questions