Plant diagnosis: symptoms need confirmation
| English | 中文 | Pinyin |
|---|---|---|
| diagnosis/ˌdaɪəɡˈnəʊsɪs/ | 诊断 | zhěn duàn |
| test kit/test kɪt/ | 检测试剂盒 | jiǎn cè shì jì hé |
What would explain this observation?
- Higher Tier: A photograph can show a leaf spot clearly without revealing the organism responsible. Diagnosis 诊断 uses observations plus a suitable reference or confirming test.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Possible plant disease signs include stunted growth, spots on leaves, areas of decay, growths, malformed stems or leaves, discolouration and the presence of pests. These observations can narrow an investigation but are not all specific to one pathogen. Mineral deficiency, for example, can also cause stunting or discolouration.
- diagnosis: Identification of a cause using observations and suitable evidence; test kit 检测试剂盒: Materials for detecting a stated target under specified instructions.
What makes a monoclonal plant test specific?
The specification identifies gardening manuals or websites, laboratory identification of pathogens and test kits containing monoclonal antibodies as methods of identification. A specific antibody binds an appropriate target associated with a pathogen. Interpretation still requires valid controls and attention to the kit’s stated target and limitations.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- The specification identifies gardening manuals or websites, laboratory identification of pathogens and test kits containing monoclonal antibodies as methods of identification. A specific antibody binds an appropriate target associated with a pathogen. Interpretation still requires valid controls and attention to the kit’s stated target and limitations.
- Examine supplied images, describe the observations before naming a disease, and list plausible alternatives. Use a teacher-provided reliable reference or simulated test result to refine the identification. Record which evidence is direct and which is inferred. School work must not culture unknown plant pathogens or use a test outside its instructions.
Which two habits make the investigation or model in this case more defensible?
Examine supplied images, describe the observations before naming a disease, and list plausible alternatives. Use a teacher-provided reliable reference or simulated test result to refine the identification. Record which evidence is direct and which is inferred. School work must not culture unknown plant pathogens or use a test outside its instructions.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: a fictional set of 40 symptom photographs contains 26 independently confirmed pathogen cases and 14 other causes. Confirmed pathogen proportion = 26/40×100 = 65%. This demonstrates why visible symptoms alone do not prove infection. It does not provide a sensitivity or specificity value for an unspecified test.
A fictional set confirms pathogens in 18 of 30 symptomatic plants. Calculate the percentage. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
A fictional set confirms pathogens in 18 of 30 symptomatic plants. Calculate the percentage.
The result is 60 %. Known: a fictional set of 40 symptom photographs contains 26 independently confirmed pathogen cases and 14 other causes. Confirmed pathogen proportion = 26/40×100 = 65%. This demonstrates why visible symptoms alone do not prove infection. It does not provide a sensitivity or specificity value for an unspecified test.
Check the conclusion and its limits
- A symptom list is not a guaranteed diagnosis. A positive target test concerns the target named by that test; it does not identify every possible plant disease. Reliable references and laboratory evidence complement careful observation rather than replace it.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
A photograph of a symptom always identifies the pathogen conclusively. This claim is false: A symptom list is not a guaranteed diagnosis. A positive target test concerns the target named by that test; it does not identify every possible plant disease. Reliable references and laboratory evidence complement careful observation rather than replace it.
Plant diagnosis: symptoms need confirmation: The specification identifies gardening manuals or websites, laboratory identification of pathogens and test kits containing monoclonal antibodies as methods of identification. A specific antibody binds an appropriate target associated with a pathogen. Interpretation still requires valid controls and attention to the kit’s stated target and limitations.
A photograph of a symptom always identifies the pathogen conclusively.
A symptom list is not a guaranteed diagnosis. A positive target test concerns the target named by that test; it does not identify every possible plant disease. Reliable references and laboratory evidence complement careful observation rather than replace it.
Identification of a cause using observations and suitable evidence: write the technical term.
diagnosis means Identification of a cause using observations and suitable evidence.