[问答题]
The white clover (Trifoliu
zw)s)kyqu b kp*1(w8jm repens) is native to
:d27*fgy g bqtxe2cf-e o o+xtu-hu-8the fields around Cornell University. The image shows a 10m x 15m area of the park, where quadrats (1m2
xo-7bycu tqd he ex:-o8gg*tu 22+ -ff) were used to measure the number of white clover in the fields. The results from 10 of the quadrats are also shown below.
1.Describe how quadrats could be used to estimate the mean number of white clover in the field.
2.Calculate the mean number of white clover in the field, showing your working.
3.Explain why this type of sampling can only be used for sessile or immobile organisms.
4.Suggest two limitations of quadrat sampling.
5.State the statistical test that could be conducted to check if white clover are associated with another organism in the field.
6.There are nitrogen fixing bacteria in the root nodules of the white clover. State two ways that the white clover uses the nitrogen provided by the bacteria.
