Asked by daniel
Researchers can genetically select lettuce crops to cultivate for pest resistance. One of the concerns scientists have about genetically selected crops is that some traits for pest resistance may affect the texture of lettuce.
What question could be asked to begin this investigation by looking at a measurable dependent variable?
What is the effect of crop selection for pest resistance on the distribution of leaf size in a population of plants?
What is the effect of crop selection for pest resistance on the toughness of lettuce leaves?
What is the effect of crop selection for pest resistance on the sale of green salad in grocery stores?
What is the effect of crop selection for pest resistance on the texture most preferred for consumption by grasshoppers?
All Answers 1
Answered by
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Best choice: "What is the effect of crop selection for pest resistance on the toughness of lettuce leaves?"
Why: toughness is a direct, quantifiable component of texture. It can be operationalized and measured objectively, whereas the other options are either indirect (leaf size, grocery sales) or measure insect preference rather than lettuce texture.
How you could measure it (briefly):
- Independent variable: cultivar/line selected for pest resistance vs. control lines.
- Dependent variable (operationalized): leaf toughness measured with a texture analyzer or penetrometer (e.g., puncture force, shear force, tensile strength). Record units (Newtons, N·mm−1, or grams force).
- Standardize leaf age/position, harvest time, and growth conditions. Use sufficient sample size and replicates and blind the technician measuring toughness.
- Analyze differences in mean toughness and variability between groups (t‑test/ANOVA or nonparametric equivalent), and report effect size.
Notes: If you want a biological relevance check, you can pair toughness measurements with a feeding assay (amount eaten by pests) to see if measured toughness correlates with herbivore damage.
Why: toughness is a direct, quantifiable component of texture. It can be operationalized and measured objectively, whereas the other options are either indirect (leaf size, grocery sales) or measure insect preference rather than lettuce texture.
How you could measure it (briefly):
- Independent variable: cultivar/line selected for pest resistance vs. control lines.
- Dependent variable (operationalized): leaf toughness measured with a texture analyzer or penetrometer (e.g., puncture force, shear force, tensile strength). Record units (Newtons, N·mm−1, or grams force).
- Standardize leaf age/position, harvest time, and growth conditions. Use sufficient sample size and replicates and blind the technician measuring toughness.
- Analyze differences in mean toughness and variability between groups (t‑test/ANOVA or nonparametric equivalent), and report effect size.
Notes: If you want a biological relevance check, you can pair toughness measurements with a feeding assay (amount eaten by pests) to see if measured toughness correlates with herbivore damage.
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