The primary root of a seedling grows down
a. to avoid light.
b. in response to gravity.
c. because the cells on the upper surface of the
root elongate more rapidly than those on
the lower surface of the root.
d. in response to different concentrations of
auxin.
e. because of all of these except "to avoid
light."
E
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What information is used to calculate the age-specific fertility rate, mx?
A. net reproductive rate B. total number of offspring born to females of reproductive age C. per capita growth rate D. proportion of female offspring born to females of reproductive age E. age at first reproduction
You have a sample of cat emesis (vomit) and find worms in the sample. The cylindrical worms are long and slender,
pointed at each end, with no other distinguishing characteristics. You conclude they are members of which phylum? a. Platyhelminthes b. Nematoda c. Cnidaria d. Annelida e. Nemertea
The membrane attack complex is involved in specific immune defense mechanisms.
Answer the following statement true (T) or false (F)
The copulatory organ of the earthworm is the
a. penis. b. clitellum. c. gonopodium. d. vestibule.