Calcification results in the buildup of dissolved alkaline salts in the B horizon of soils
Indicate whether the statement is true or false
TRUE
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Which of the following plant structures shares the most common features and functions with a fungal hyphae?
A) stomata B) vascular cambium C) lenticels D) root hairs E) prop roots
Dissolved oxygen content in stream water is affected by
(a) organic matter in the water. (b) overgrowth of algae. (c) water nutrient levels. (d) all of the above.
Consider the model for the equilibrium number of species in a mainland (continental) region, as illustrated in Figure 20.23. What does this model say about the rate of speciation?
A) The rate of speciation decreases as a linear function of the number of species. B) The rate of speciation increases as a linear function of the number of species. C) The rate of speciation increases as a function of the number of species, but the rate of increase decelerates as the number of species becomes large.
Agar is an excellent solidifying agent for microbiological media because ________.
A. solid agar remains solid until the temperature is raised to 90°C, and liquid agar remains liquid if the temperature is lowered to 45°C B. it is not degraded by most microorganisms and solid agar remains solid until the temperature is raised to 90°C, and liquid agar remains liquid if the temperature is lowered to 45°C C. it is not degraded by most microorganisms D. agar provides an excellent source of nutrition for a variety of different microorganisms