What is the most likely consequence of a mutation that causes sporopollenin to degrade quickly after it is synthesized?
A. A reduction in the ability of pollinators to detect and transfer pollen grains to a stigma.
B. A reduction in the ability of pollen and spores to disperse to new areas.
C. A reduction in the ability of the integument of an ovule to develop into a seed coat.
D. A decrease in the number of sperm that can be produced.
E. A decrease in the ability of the pollen grain or spore to open when a suitable location is found.
B. A reduction in the ability of pollen and spores to disperse to new areas.
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The chewy, stringy cells in celery are which cells?
a. xylem b. collenchyma c. phloem d. sclerenchyma e. parenchyma
Adaptive radiations can be a direct consequence of three of the following four factors. Select the exception.`
A) Vacant ecological niches B) Genetic drift C) Colonization of an isolated region that contains suitable habitat and few competitor species D) An adaptive radiation in a group of organisms (such as plants) that another group could use as food
The phase of energy metabolism that is triggered by the expectation of food is the ________ phase.
Fill in the blank(s) with the appropriate word(s).
The growth of bacterial cultures is best described as
A) arithmetic growth. B) lag growth. C) logarithmic growth. D) cell division. E) replication.