Pseudocoel means “false body cavity.” Why is this term applied to the body cavity of roundworms?
What will be an ideal response?
Because their body cavity is not lined by a derivative of the mesoderm.
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In the annual rings of woody trees, how does the cell size within the xylem of the spring and summer wood compare to the fall and winter wood?
A. It is more dense. B. It has smaller vessels. C. The cell walls are thicker. D. It is younger. E. The cells are larger.
What term describes a species with a disproportionately large effect on a community relative to its abundance?
a. pioneer b. indicator c. keystone d. exotic e. invasive
Gases such as nitrous oxide and carbon dioxide are called greenhouse gases because they
A) block sunlight from reaching Earth. B) block specific wavelengths of sunlight from penetrating. C) permit sunlight to enter but trap the heat energy in the atmosphere. D) block both sunlight and heat energy from penetrating the atmosphere. E) stimulate photosynthesis in most plants.
A sample of the tissue from an inflamed, pus-filled area on the lower leg is treated with KOH and stained with GMS. Under the microscope golden brown spheres are visible. With what disease are these observations consistent?
A) pityriasis B) fungemia C) chromoblastomycosis D) mycetoma E) sporotrichosis