Which of the following models of growth takes
place when the amount of available resources
is not limiting?
a. arithmetic growth
b. logistic growth
c. logarithmic growth
d. exponential growth
e. exponential growth and arithmetic growth
D
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What category describes a species that, while not presently at risk of extinction, could likely be at risk of extinction in the near future?
A. A species of concern B. A threatened species C. An invasive species D. An endemic species
Plants can have ___________ defenses, which are always active, or _________ defenses, which are produced only when a plant is threatened
A. inducible; constitutive B. constitutive; inducible C. chemical; mechanical D. mutualistic; symbiotic
A mycelium is best defined as a(n) ____
a. mushroom b. mass of hyphae c. association between a fungus and a plant root d. reproductive structure of a fungus e. fungal cell
Auxin concentration gradients
a. appear once germination begins. b. promote the transcription of an enzyme that breaks down cytokinin. c. allow formation of plant parts in expected patterns. d. help young cells elongate so that shoots and roots lengthen. e. are described by all of these EXCEPT "appear once germination begins."