Photoautotrophs reside in the ________ zone(s) of marine environments.
A. abyssal
B. limnetic
C. littoral
D. both limnetic and littoral
E. abyssal, limnetic, and littoral
Answer: D
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A. flagella. B. organelles. C. receptors. D. cilia. E. chromosomes.
The herbicide 2,4-D affects the metabolism of dicots and kills most of them. What is a common feature of plants that are susceptible to 2,4-D?
A) branching leaf veins B) flower parts in threes C) one cotyledon in the seed D) vascular tissue scattered throughout the stem
Carbon dioxide concentrations fluctuate in predictable seasonal patterns on the surface of the planet largely as a result of
A) the influence of vegetation patterns in tropical systems. B) weathering of rock surfaces following seasonal rain events. C) vegetation growth and flux patterns in aquatic systems. D) large-scale patterns of terrestrial plant uptake and dormancy.
According to one hypothesis, the first eukaryotic cells originated by
A. spontaneous generation. B. biogenesis. C. endosymbiosis. D. mitosis.