本题目来源于试卷: SL Topic C4.1 Populations and communities，类别为 IB生物学
[问答题]
8. Describe how quadrat sam z4)fsqz,eki4 plinc8 *- eknoyip/g could be used to compare dandelion population density in two fields, one of which is grazed by sheep, the other is not grazed by- cp*enok/y8i sheep.
参考答案: Sampling must be random.
Measuring tape (or string) is laid out on two sides of the field.
Random numbers are generated on a calculator to determine quadrat positions.
Quadrats are placed on the grid locations.
The number of dandelion plants in the quadrat are counted.
Sufficient quadrat samples, repeats, must be taken to ensure a valid sample.
The data is compared using a suitable statistical test (chi-squared test or t-test).
本题详细解析:
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