The growth-promoting substance that promotes stem elongation and bending toward light is produced
primarily in
a. root tips, traveling to the stem in the xylem.
b. the center of the stem region where elongation or bending occurs.
c. flowers and flower buds.
d. the shoot tip.
e. root tips, traveling to the stem in the phloem.
D
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Why isn't oxygen produced by organisms that perform anoxygenic photosynthesis?
a. their photosystems do not utilize the Calvin cycle b. they use a different enzyme for the initial reactions of the Calvin cycle c. they use electron donors other than water d. their membranes lack ATP synthase e. their chlorophyll contains an iron center rather than magnesium
You perform an experiment in which you take 16 pots of strawberry plants and give half of them 1 gram of ammonium nitrate per liter of water and the other half just gets water. Each group is then split in half again, and exposed to either 8 or 16 hours of light each day. You monitor the height of the plants for four weeks. You observe that increasing ammonium nitrate and light both increase plant height.
Which of the following is/are an independent variable(s) in this experiment? A. the amount of ammonium nitrate B. the height of the plants C. the height of the plants and amount of light D. the amount of ammonium nitrate and light E. the amount of light
If 2 spot (S) is dominant to 4 spot (s), give the genotypes for the parents in the following crosses:
(a) 2 spot × 2 spot yields 2 spot and 4 spot (b) 2 spot × 4 spot yields only 2 spot (c) 2 spot × 4 spot yields 2 spot and 4 spot (d) 2 spot × 2 spot yields only 2 spot (e) 4 spot × 4 spot yields only 4 spot What will be an ideal response?
Which of the following statements is NOT a
possibility even though the phylogenetic lineages for hominins are not definitive? a. Homo preceded Australopithecus. b. Homo sapiens is the most recent. c. Australopithecus is probably more ancient than Homo. d. Homo erectus preceded Homo sapiens. e. Homo and Australopithecus may have evolved at the same time.