A potential source of nitrogen in a sandy soil environment might be the bacterium, Rhizobium, which inhabits the root nodules of leguminous plants. Which of these statements is true, and should prevent Rhizobium or other root-inhabiting nitrogen-fixers from contributing nitrogen to the soil in this experiment?
A) Mosses have no roots.
B) Moss gametophytes lack stomata.
C) Mosses evolved before there were substantial amounts of nitrogen in Earth?s atmosphere.
D) Among land plants, only legumes are known to establish symbiotic relationships with members of other
kingdoms.
Ans: A) Mosses have no roots.
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Observing a patient who has been given an experimental drug, you notice that it constricts blood vessels and slows digestion, making its effects similar to those of
A. calcitonin. B. epinephrine. C. insulin. D. glucagon. E. testosterone.
Cereal grains come from which types of plants?
A) dicots B) monocots C) legumes D) tubers
Based on the temperature range and precipitation, the area on the accompanying figure labeled as 5 represents which of
the following biomes? a. savanna b. temperate deciduous forest c. temperate rain forest d. taiga e. tundra
Which of the following threats to biodiversity is involved in the majority of the cases?
a. habitat loss b. global climate change c. introduction of exotic species d. overharvesting