Mycorrhizae are ____
a. intertwined roots of different species of plants
b. connecting points between branching roots
c. symbiotic associations between a fungus and plant roots
d. specialized root hairs
e. localized swellings in plant roots filled with nitrogen-fixing bacteria
ANSWER: c
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Which of the following is NOT a form of passive
transport? a. osmosis b. facilitated diffusion c. simple diffusion d. exocytosis e. none of these
The asteroid impact of about 65 million years ago led to the extinction of
a. sequoia trees. b. giant redwood trees. c. dinosaurs and some other life forms. d. giant squid. e. undersea creatures similar to the "Loch Ness Monster."
The hepatic portal system is a special blood circuit between the ____ and ____
a. liver; spleen b. kidney; liver c. liver; intestine d. kidney; heart e. spleen; heart
The light reactions of photosynthesis supply the Calvin cycle with __________.
Fill in the blank(s) with the appropriate word(s).