Ivan Valiela's hypothesis that the growth of salt marsh grass is limited by nitrogen availability was:
a. disproved by the growth of larger and taller grass in his control (nitrogen-fertilized) plots.
b. disproved by the growth of larger and taller grass in his experimental (nitrogen-fertilized) plots.
c. supported by the growth of larger and taller grass in his experimental (nitrogen-fertilized) plots.
d. supported by the growth of larger and taller grass in his control (nitrogen-fertilized) plots.
e. unsupported by a poor experimental design.
C
You might also like to view...
Which structures are homologous to testes in human females?
a. Cowper’s gland b. prostate c. ovaries d. greater vestibular glands
The heart damage associated with Lyme disease is
a. rheumatic fever b. hypertension c. endocarditis d. myocarditis e. malignant melanoma
When one tallies the species in a community by numbers of individuals, one typically finds that:
A) all species have about the same number of individuals. B) most species are dominant, whereas a few others are represented by relatively few individuals. C) a few species are dominant, whereas most others are represented by relatively few individuals. D) there is no general pattern in the relative abundances of species.
A fruit fly population has a gene with two alleles, A1 and A2. Tests show that 70% of the gametes produced in the population contain the A1 allele. If the population is in Hardy-Weinberg equilibrium, what proportion of the flies carry both A1 and A2?
a. 0.42 b. 0.7 c. 0.49 d. 0.21 e. 0.09