Pyramids of numbers are of limited usefulness because they:a
do not indicate the biomass of the organisms at a given time.
b. do not indicate the gross primary productivity of each species.
c. do not include energy flow through the ecosystem.
d. include three trophic levels.
e. have limited reliability of the actual numbers involved.
a
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In the vascular bundles of most dicot stems, primary phloem differentiates toward the ________of the stem, while primary xylem differentiates toward the ________of the stem.
A. middle; outside B. cork cambium; vascular cambium C. outside; middle D. shoot tip; roots E. middle; middle
Which is a characteristic of seminal fluid?
A) It consists of sperm and secretions. B) It is acidic. C) It travels through the large intestine to the anus. D) It is free of prostaglandins and nutrients.
Which of the following processes is closely
associated with the normal functioning of the “cystic fibrosis” gene?
a. water osmosis b. sodium - chloride pumping c. protein diffusion d. pH regulation e. polypeptide packaging
Which statement concerning REM sleep is true?
a. During the REM stage, delta waves are emitted. b. Most people spend almost all of their sleep time in the REM stage. c. The preoptic area of the hypothalamus stimulates REM sleep. d. During REM sleep, blood flow to the entire brain decreases. e. REM sleep is absolutely necessary, as a lack of this stage causes anxiety and irritability.