Draw a biomass pyramid to a stated scale
| English | 中文 | Pinyin |
|---|---|---|
| biomass/ˌbaɪəʊˈmæs/ | 生物量 | shēng wù liàng |
| scale/skeɪl/ | 比例尺 | bǐ lì chǐ |
What would explain this observation?
- Many tiny plants can have more total biomass 生物量 than a few large animals. A biomass pyramid represents mass at each level rather than organism count.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- A pyramid of biomass represents relative biomass at successive trophic levels. Producers, trophic level 1, form the bottom bar. Use the supplied biomass measure, commonly dry mass per unit area, consistently. Bars at higher levels are centred above the lower bars, and their widths are proportional to the stated biomass.
- biomass: Mass of biological material measured using the stated method; scale 比例尺: A defined relationship between drawn length and represented quantity.
Where should the producer bar be placed?
The pyramid is a diagram of a defined sample or estimate, not the physical shape of an ecosystem. Equal bar heights allow width to represent relative amount. Biomass and energy are related but are not the same quantity; do not label a kilogram dataset in joules. Organism numbers also require different data.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- The pyramid is a diagram of a defined sample or estimate, not the physical shape of an ecosystem. Equal bar heights allow width to represent relative amount. Biomass and energy are related but are not the same quantity; do not label a kilogram dataset in joules. Organism numbers also require different data.
- Convert all masses into one unit, choose a scale fitting the page and calculate each width. Centre bars, label organisms, trophic levels and units and keep producer placement clear. If one bar is too small to draw accurately, state a scale limitation rather than silently giving it a false width.
Which two habits make the investigation or model in this case more defensible?
Convert all masses into one unit, choose a scale fitting the page and calculate each width. Centre bars, label organisms, trophic levels and units and keep producer placement clear. If one bar is too small to draw accurately, state a scale limitation rather than silently giving it a false width.
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: supplied biomasses are 600, 120 and 24 kg over the same area. At 100 kg per centimetre, widths are 6.0, 1.2 and 0.24 cm. Keep a common scale; drawing each bar to a separate convenient scale destroys the quantitative comparison.
At a scale of 200 kg per centimetre, find the width for 1,000 kg biomass. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
At a scale of 200 kg per centimetre, find the width for 1,000 kg biomass.
The result is 5 cm. Known: supplied biomasses are 600, 120 and 24 kg over the same area. At 100 kg per centimetre, widths are 6.0, 1.2 and 0.24 cm. Keep a common scale; drawing each bar to a separate convenient scale destroys the quantitative comparison.
Check the conclusion and its limits
- Pyramid width does not represent the height of an organism. More individuals does not always mean greater biomass. Masses from different habitat areas need comparable per-area units before being placed in one pyramid.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
A biomass pyramid represents organism count regardless of mass. This claim is false: Pyramid width does not represent the height of an organism. More individuals does not always mean greater biomass. Masses from different habitat areas need comparable per-area units before being placed in one pyramid.
Draw a biomass pyramid to a stated scale: The pyramid is a diagram of a defined sample or estimate, not the physical shape of an ecosystem. Equal bar heights allow width to represent relative amount. Biomass and energy are related but are not the same quantity; do not label a kilogram dataset in joules. Organism numbers also require different data.
A biomass pyramid represents organism count regardless of mass.
Pyramid width does not represent the height of an organism. More individuals does not always mean greater biomass. Masses from different habitat areas need comparable per-area units before being placed in one pyramid.
Mass of biological material measured using the stated method: write the technical term.
biomass means Mass of biological material measured using the stated method.