68. Plant species adapted to resource-poor communities often have low growth res
ID: 265729 • Letter: 6
Question
68. Plant species adapted to resource-poor communities often have low growth responses to fertilization because these plants typically havea a. high tolerance for excess nutrients. b. low tolerance for excess nutrients. c. high intrinsic growth rate. d. low intrinsic growth rate 69. How does one estimate the NPP if one knows the NEE (net ecosystem exchange)? a. NPP NEE -heterotrophic respiration b. NPP NEE+ autotrophic and heterotrophic respiration C. NPP NEE + heterotrophic respiration d. NPP-NEE-atmospheric CO2 70. Suppose you wanted to determine whether you had adequately sampled the species richness of a given community. Which result would lead most strongly to the conclusion that the current sampling had adequately assessed the species diversity? a. A high Shannon index value b. A low Shannon index value c. A linear species accumulation curve d. A species accumulation curve that leveled off 71. Which statement about net secondary production is FALSE? a. Net secondary production depends on the digestibility and nutrient content of the heterotrophs' food. b. As a percentage of NPP, net secondary production is usually higher in terrestrial ecosystems than in aquatic ecosystems c. In most terrestrial ecosystems, the lowest percentage of net secondary production is associated with detritivores. d. In most terrestrial ecosystems, net secondary production is a small fraction of NPP.Explanation / Answer
68. d low intrinsic growth rate
This is usually due to lack of availability of resources
69. c NPP= NEE+ heterotrophic respiration
The net Carbon balance of an ecosystem can be assessed by both NEE and NEP- Net Ecosystem Production (which is the difference between Net Primary Production (NPP)and heterotrophic ecosystem respiration)
70 c. A linear species accumulation curve
The Species accumulation curve is a graph recording the cumulative number of species that are living in a particular environment as a result of the function of the cumulative effort expended in looking out or searching for them. It Is usually measured in person-hours
71 b. As a percentage of NPP, net secondary production is usually higher in terrestrial ecosystems than in aquatic ecosystems.
As a percentage of NPP, net secondary production is usually higher in aquatic ecosystems
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