Use the following study to answer the following question(s): A researcher applies varying amounts of fertilizer (0, 2, 4, 8, 10 units) to 50 potted tomato plants. All other variables that may affect the outcome (watering, temperature, sunlight, plant size, etc.) are kept the same from pot to pot. At the end of the growing season, the tomatoes grown on each plant are weighed to determine which fertilizer level produced the largest tomato yield.Is the study presented above a controlled experiment?
A. Yes, because many pots were used.
B. No, because the experiment was done only once.
C. No, because several different amounts of fertilizers were used, not just one amount.
D. Yes, because only the amount of fertilizer was changed, everything else was kept the same.
Answer: D
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Answer the following statement true (T) or false (F)
In horses, rodents, and lagomorphs, the digestion of cellulose by microorganisms takes place in the
A. duodenum. B. reticulum. C. cecum. D. omasum. E. abomasum.
Maternal control elements in the oocyte’s cytoplasm
consist largely of a. DNA. b. RNA. c. cytoskeletal elements. d. cytoplasmic organelles. e. specialized proteins.
Polyploidy can be described as ____.
A. only occurring artificially B. only occurring when there is one set of chromosomes C. fatal to all living things D. occurring in about 20% of flowering plants E. fatal in humans but common in flowering plants