A directional adjustment of growth in response to environmental stimuli is called ____
a. circadian rhythm
b. vernalization
c. photoperiodism
d. statolith
e. tropism
ANSWER: e
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Members of this Ecdysozoan phylum include many important decomposers, but also many damaging
parasites. Many parasitize the roots of plants, while others cause disease in animals. More than 1 billion people worldwide are estimated to be infected by members of this group such as pinworms, trichinas, and filarial worms.
a. Arthropoda b. Onychophora c. Nemertea d. Annelida e. Nematoda
The movement of sugars and other organic molecules through phloem is called __________. Fill in the blank(s) with the appropriate word(s)
The point at which a nerve impulse is initiated is the ____
a. initiation threshold b. initiation potential c. action potential d. graded potential e. threshold potential
Chemical reactions may ______ energy.
a. absorb b. release c. require d. all of the above