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2005Exam_Practiceh - Bio 20B final 1 Cheating policy = Zero...

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Bio 20B final - 1 Cheating policy = Zero Tolerance: Anyone who is convicted of cheating on this test will get an F in the course. If you observe someone cheating, we ask that you immediately provide this information to Dr. Parker or one of the TA’s. This is Exam Version A. Write an “A” at the top of your scantron form, plus your NAME! CHOOSE THE ONE BEST ANSWER FOR EACH QUESTION. Be sure that the circles on your scantron form are filled in completely and carefully, and that all erasures are complete. 1) Before you plant your garden, you add soil supplements (e.g. lime) to raise the pH of the soil. Why do you do that? A) To improve the water-holding capacity of the soil B) To improve the growth of mycorrhizae C) To reduce the leaching of cations (+ charge) from clay particles D) To reduce the leaching of anions (- charge) from organic matter 2) Before planting your pea seedlings, you set up a trellis for them. What is it that causes pea plants to curl around the trellis? A) Phototropism B) Auxin polar transport C) Thigmotropism D) the Z-scheme 3) You create a new raised bed, and start off by soaking the bed with fungicide to get rid of all fungi in the soil. You plant various native grass species and discover that some of them don’t grow nearly as well in the sterile bed as they do in other (nonsterile) parts of your garden. What is one plausible hypothesis for this pattern? A) The plants naturally rely on pathogens in the soil. B) The plants naturally rely on groundwater movement. C) The plants naturally rely on rhizobia. D) The plants naturally rely on mycorrhizae. E) The plants are naturally afraid of heights. 4) You have a basil plant (a non-woody dicot) that grew up and up and now it’s too tall. What would be the easiest and most effective thing to do to get more basil leaves? A) Prune the top so it will grow new branches from the lateral meristems. B) Prune the top so it will grow new branches from the apical meristems of the lateral buds. C) Cut off the top 10 centimeters to stimulate growth from the apical bud. D) Cut off the top 10 centimeters to reduce concentrations of cytokinin.
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Bio 20B final - 2 5) You plant 100 radish seeds. They all germinate, but the roots of two of them grow in random circles instead of growing down into the soil. They probably have a mutation involving:
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