In algae and plants with a life cycle characterized by alternation of generations, the _____ produces spores by ______
a. zygote; meiosis
b. gametophyte; mitosis
c. gametophyte; meiosis
d. sporophyte: mitosis
e. sporophyte; meiosis
E; In plants and algae with alternation of generations, the diploid sporophyte produces spores by meiosis. In some algae, the only diploid cell is the zygote, which undergoes meiosis (choice a), but this is not a full alternation of two generations. Gametes are produced by meiosis in animals, but in plants the gametophyte produces them by mitosis (choice c).
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The nitrogen-limitation hypothesis states that organisms select food in terms of the nitrogen content of the tissue. Why might this be true?
A. Animal tissue contains about 10 times as much nitrogen as plant tissue. B. Animals are able to "fix" nitrogen much more effectively than plants. C. Herbivores prefer plants with lower nitrogen content. D. High nitrogen levels are a key part of plant chemical defenses. E. Plant tissue contains about 10 times as much nitrogen as animal tissue.
Which circumstance led to the collapse of the Khmer civilization?
a. road building b. salty soils from irrigation c. reforestation d. change in climate
According to the convention for properly writing Latin binomials, the scientific name for modern
human beings should be written as
a. Homo sapiens. b. Homo Sapiens. c. Homo sapiens. d. homo sapiens. e. homo sapiens.
Forks, Washington receives about 270
centimeters of rain per year. On the other side of the Olympic Mountains only 70 miles away, Sequim, Washington receives about 40 centimeters of rainfall per year. Both are close to major bodies of water and at the same elevation. What is the most likely reason for why there is such a large difference in rainfall between the two towns?
a. Sequim is probably at a latitude closer to 30 degrees while Forks is probably at a latitude closer to 90 degrees b. Sequim is in the rain shadow of the Olympic Mountains c. Sequim probably is receiving a higher amount of solar radiation than Forks d. the ocean near Sequim is drier than the ocean near Forks e. none of these answers are plausible