Higher Tier: controlling plant growth commercially
הוצג| English | משמעות |
|---|---|
| rooting powder/ˈruːtɪŋ ˈpaʊdə/ | אבקת שורשים |
| seed dormancy/siːd ˈdɔːmənsi/ | שינה בזרע |
What would explain this observation?
- Higher Tier: A grower may want roots on a cutting, controlled fruit ripening or germination at the right time. The useful hormone depends on the intended result.
Build the model
- Auxins are used as weed killers, rooting powders 生根粉 and to promote growth in tissue culture.
- Ethene is used in the food industry to control fruit ripening during storage and transport.
- Gibberellins can end seed dormancy 种子休眠, promote flowering and increase fruit size.
- Match the use to a specific effect rather than calling every product a general fertilizer.
- rooting powder: A product using plant growth hormones to encourage roots on cuttings.
- seed dormancy: A state in which a viable seed does not germinate until suitable conditions or signals occur.
Which use matches ethene?
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
Ethene is the ripening hormone, so it is used to control fruit ripening during storage and transport. It supplies no nitrogen and has nothing to do with red blood cells.
Match each technical term to its precise meaning.
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- A weed-killer application can change plant diversity and affect organisms depending on those plants.
- Evaluate intended crop benefits alongside non-target effects, biodiversity and the stated treatment conditions.
- A rooting comparison measures root formation, while a fruit-size comparison needs dimensions or mass; neither is automatically evidence for the other hormone uses.
In the lab: Use fictional horticultural trials or teacher-supervised approved propagation. Keep plant variety, cutting size, growth conditions and observation time comparable. Follow school product handling instructions; do not apply weed killers to a habitat or release ripening gases as an independent school task. Tissue culture requires approved aseptic methods rather than unknown cultures.
Which two habits make the investigation or model in this case more defensible?
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
Stating the conditions and assumptions lets others repeat the work exactly, and recording the supporting evidence lets them check the conclusion. Hiding disagreeing results removes the evidence that could challenge a wrong conclusion, and one measurement can never establish a wider claim.
Work from known quantities
- Known: a fictional rooting trial has 18 rooted cuttings among 24 with a stated treatment and 12 among 24 in a control.
- Proportions are 75% and 50%; difference = 25 percentage points.
- This supports the stated rooting comparison, not an unlimited dose response or a recommendation for every plant.
Your turn: A fictional trial has 21 rooted cuttings among 28. Calculate the percentage.
A fictional trial has 21 rooted cuttings among 28. Calculate the percentage.
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
The result is 75 %. Known: 21 rooted cuttings among 28. Use percentage = rooted / total x 100. Percentage = 21/28 x 100 = 75%. A control comparison is needed before crediting the treatment.
Check the conclusion and its limits
- Hormones coordinate growth; mineral fertilizers provide nutrients and are a different intervention.
- A result for cuttings does not prove a fruit-ripening effect.
- Commercial benefits do not remove the need to evaluate non-target and biodiversity effects.
Not true: A growth hormone is the same intervention as a mineral fertilizer. A hormone is a signalling molecule that coordinates growth; a fertiliser supplies mineral nutrients such as nitrate. One coordinates, the other feeds - different interventions.
- Auxins are used as weed killers, rooting powders and to promote growth in tissue culture.
- A weed-killer application can change plant diversity and affect organisms depending on those plants.
- Watch for: hormones coordinate growth; mineral fertilizers provide nutrients and are a different intervention.
A growth hormone is the same intervention as a mineral fertilizer.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
A hormone is a signalling molecule that coordinates growth; a fertiliser supplies mineral nutrients such as nitrate. One coordinates, the other feeds - different interventions.
A product using plant growth hormones to encourage roots on cuttings: write the technical term.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
rooting powder means A product using plant growth hormones to encourage roots on cuttings.