The plant tissue responsible for conducting water and nutrients up from the roots is the
A) leaf.
B) xylem.
C) phloem.
D) stomata.
B
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Which of the following ecosystems has the highest average net primary productivity?
A) Algae beds and coral reefs B) Estuaries C) Freshwater swamp and marsh D) Open Ocean E) Upwelling zone
A diesel locomotive of mass 4m coasting at 10 km/h collides inelastically with a stationary flatcar of mass m. The speed of the locomotive-flatcar combination when stuck together is
A. 8 km/h. B. 4 km/h. C. more than 8 km/h. D. 6 km/h.
The hydrologic cycle includes all of the following processes except
A. evaporation. B. precipitation. C. uplift. D. runoff.
The world's 30,000 known species of spiders
a. kill more livestock with poisonous bites than any other threat. b. have to be controlled in order for integrated pest management to work properly c. are a threat not only to livestock, but also to rural farmers because they nest in sheds where equipment is stored and later retrieved. d. kill far more crop-eating insects every year than humans do by using chemicals. e. Are at the bottom of the food chain in agricultural settings and so provide important food for birds that control caterpillar populations.