Your favorite tree is dying, and you find that there is a fungal infection on its leaves. If you were to look at the cells of
the infected leaves of your tree, which structure(s) would you expect to find?
a. mycorrhizae
b. arbuscules
c. haustoria
d. both mycorrhizae and arbuscules
e. both mycorrhizae and haustoria
ANSWER: c
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What is the ecological explanation for why sunflowers and grassy weeds thrive in your untended, sunny garden, but mosses, which require shade, do not?
A. Communities depend on interactions among organisms. B. Communities depend on their physical environment. C. Disturbance can modify community composition. D. All of the responses are correct. E. None of the responses is correct.
Natural selection acts directly on the genotype of an organism
_______ Indicate whether the statement is true or false.
The sensory nerves of the somatic portion of the peripheral nervous system:a
transmit information from internal receptors to the central nervous system. b. transmit information from sensory organs to the central nervous system. c. transmit information from the central nervous system to glands. d. transmit information from the central nervous system to skeletal muscles. e. regulate cardiac activity
Most of the ultraviolet radiation reaching the upper atmosphere is absorbed by
A. ozone. B. water vapor. C. nitrogen. D. carbon dioxide. E. CFCs.