Adaptations: feature, effect and environmental advantage
הוצג| English | משמעות |
|---|---|
| adaptation/ˌædæpˈteɪʃn/ | הסתגלות |
| extremophile/ekˈstreməfaɪl/ | קיצוניסט |
What would explain this observation?
- A thick fur coat has a different value in a cold habitat and a hot one. An adaptation 适应性 explanation needs the environmental condition as well as the feature.
Build the model
- Adaptations are features that help organisms survive in conditions where they normally live.
- Structural adaptations concern body features, behavioural adaptations concern actions and functional adaptations concern biological processes.
- A supplied desert-plant example might have a reduced leaf surface limiting water loss; the explanation must connect that feature to scarce water.
- adaptation: A feature helping survival in the organism’s normal environment.
- extremophile 极端微生物: An organism living in conditions extreme for many organisms.
Which explanation connects a structural feature with its benefit?
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
A genuine adaptation explanation links feature to effect to advantage: smaller leaves lose less water, which helps in dry conditions. Circular statements ("it is useful because it lives there") and universal claims explain nothing.
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
- Some organisms live in extreme temperature, pressure or salt concentrations and are called extremophiles.
- The specification includes bacteria living near deep-sea vents.
- Extreme is relative to the usual conditions for many organisms, not a statement that no life can function there.
- Adaptations do not guarantee survival under every change.
In the lab: For an unfamiliar organism, read the supplied feature and habitat and write feature → effect → advantage. Classify the adaptation using the evidence, allowing that one description can include more than one kind. Use pictures or prepared material; do not expose animals or people to stressful environments.
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: two fictional leaf models lose 12 and 8 water units over the same interval.
- Reduction in the second model is (12−8)/12×100 = 33.3% to one decimal place.
- A controlled model helps test an effect, but a real plant also depends on roots, stomata and environmental conditions.
Your turn: Model water loss falls from 20 to 15 units. Calculate percentage reduction.
Model water loss falls from 20 to 15 units. Calculate percentage reduction.
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
The result is 25 %. Known: water loss falls from 20 to 15 units. Reduction = 20 - 15 = 5 units. Percentage reduction = 5/20 x 100 = 25%. A model result supports the mechanism under matched conditions.
Check the conclusion and its limits
- Saying an organism is adapted because it lives there repeats the observation without explaining it.
- Functional means a biological process, not simply that a shape is useful.
- An extremophile is not necessarily an organism from every extreme environment.
Not true: An adaptation guarantees survival in every possible environment. An adaptation suits the environment in which it evolved. A desert adaptation can be a liability in a wetland - no single feature guarantees survival everywhere.
- Adaptations are features that help organisms survive in conditions where they normally live.
- Some organisms live in extreme temperature, pressure or salt concentrations and are called extremophiles.
- Watch for: saying an organism is adapted because it lives there repeats the observation without explaining it.
An adaptation suits the environment in which it evolved.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
True. An adaptation suits the environment in which it evolved. A desert adaptation can be a liability in a wetland - no single feature guarantees survival everywhere.
A feature helping survival in the organism’s normal environment: write the technical term.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
adaptation means A feature helping survival in the organism’s normal environment.