Which of the following statements does NOT describe an essential element?
a. An element with only one role in plant metabolism may still be essential.
b. An essential element is necessary for normal growth and reproduction.
c. Plant seeds in some cases contain enough of an essential element to sustain the adult plant.
d. An essential element may occasionally be functionally replaced by another element
Ans: d. An essential element may occasionally be functionally replaced by another element
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The organisms included within any category of the taxonomic hierarchy comprise a(n) ____
a. family b. class c. order d. taxon e. domain
In a large population on a Pacific island, a few individuals had a mutation that caused them to have different colored
eyes. After a hurricane, the population was reduced to only a few individuals, but some of those individuals had the rare eye color mutation. Now, after many generations, almost half of the population on this island has different colored eyes. This is an example of _____________________. Fill in the blank(s) with the appropriate word(s).
Phosphate fertilizers have increased the amount of phosphate in lakes and other bodies of water. What effect does this increase have on the phytoplankton in the water?
A) It increases their likelihood of being eaten. B) It stimulates their growth. C) It causes them to form toxic compounds. D) It reduces their photosynthetic capacity. E) It kills them.
Rhizobia, actinomycetes, and cyanobacteria all share the common feature that they can _____
A) increase water uptake in plants B) kill parasites in the soil C) exist in extreme environments D) fix atmospheric nitrogen