During stressful situations, epinephrine initiates ____
a. dilation of blood vessels to the skin
b. dilation of blood vessels to the heart
c. constriction of blood vessels to the brain
d. a decrease in metabolic rate
e. a decrease in blood glucose levels
ANSWER: b
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An example of keystone species are ____
a. beavers that build dams b. mice that feed on mushrooms and truffles c. Douglas fir trees d. kudzu e. earthworms that aid decomposition
Refer to Figure 29-1. The structure labeled 1 is:
a. a conidium.
b. a perforated septum.
c. a hypha.
d. a basidium.
e. a spore
Nitrates and nitrites are used in cured meats to prevent ________.
A. botulism intoxication B. S. aureus food poisoning C. infection from fruits and nuts D. mold growth
Which of the following is the advantage that plants in arid habitats experience when they keep their stoma closed during hot daytime hours?
A. It brings minerals up the plant. B. It gives plants a needed rest. C. It prevents sugar transport to the guard cells. D. It helps to conserve water. E. It prevents loss of CO2.