The water and minerals absorbed by the roots
usually first enter the
a. xylem.
b. pith.
c. cortex.
d. root hairs.
e. endodermis
D
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In the early 1900s, many people, particularly in the southern U.S., suffered from infections
with parasitic hookworms. Many of these hookworms feed on blood cells of the host and thus also consume iron that is found in red blood cells. A symptom of a heavy infection is a craving to eat dirt—particularly clay-like soils with a high iron content. Thus, for these people, iron is a __________.
a. tradeoff b. constraint c. part of the organism’s niche d. nonlimiting resource
Which animal is critically endangered in the United States?
A) black-footed ferret B) mourning dove C) striped skunk D) coyote
A covalent chemical bond is one in which _____
A) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged
B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms
C) outer-shell electrons of two atoms are shared so as to satisfactorily fill their respective orbitals
D) outer-shell electrons of one atom are transferred to fill the inner electron shell of another atom
E) electrons from the same atom, but opposite spins, are paired
You buy a new house and the front yard has some really nice rose bushes, but they are surrounded by lots of weeds! You don't really want to try and dig them out by hand and your nice new neighbor comes over with a bottle of weed killer. He says it shouldn't kill your roses, but you, knowing that weeds and rose are pretty similar physiologically decide to do some research. You find out the active ingredient in the weed killer causes the stomata close when in contact with the chemical.
What would be the results of the chemical being sprayed on your roses? Explain which parts of photosynthesis would be affected, what those effects would be, and how would the plant be affected? Would it be likely to hurt your roses?