In not more than three sentences, explain why a plant placed in a window grows toward the light. What will be an ideal response?
Light causes auxin to move from the sunny side of the stem to the shaded side. This accumulation of
auxin stimulates cell elongation on the shaded side. Consequently the shaded side grows more than the
sunny side, and the plant grows toward the light.
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The seminal vesicles, prostate gland, and bulbourethral glands produce materials that
A. activate sperm. B. make semen. C. provide nourishment for sperm. D. All of the above are correct.
Which one of the following is NOT an example of behavior?
A. A plant bending toward a light B. A student sleeping in class C. The wind rustling fallen autumn leaves D. A cat purring
Which of the following results would mean that a test-cross investigation was complete, given that a pigmented alligator (M_) is crossed with an albino alligator (mm)?
a) getting 3 offspring that are pigmented b) getting 6 offspring that are pigmented c) getting a single albino offspring d) Both a) and b) are true. e) None of the above is true.
In the phalarope, or wadepiper bird, the male is unusual in playing the larger parenting role -- he performs all the egg incubation and chick care. What unusual behavior might you predict for the female of the species?
A. The females compete to mate with the males, who choose among them. B. The female provides sperm to fertilize the male's eggs. C. The females have dull, brown coloring that keeps them well-camouflaged. D. The female is part of a large harem of females, under the domain of a single male.