[问答题]
[Maximum mark: 10]
The white clover (Trifolium repens) is native to the fields around Cornell University. The image shows a 10m x 15m area of the park, where quadrats (1m
2
) were used to measure the number of white clover in the fields. The results from 10 of the quadrats are also shown below.
[Source: adapted from: NY State IPM Program at Cornell University, N. Y. S. I. P. M. P. at C. U. (2014, June 19). White Clover in soccer field. Flickr. Retrieved March 8, 2023, from https
://www.flickr.com/photos/99758165@N06/14273941729 Copyright under CC BY 4.0]
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.
