The pollen-producing structure of a flowering plant is known as the ________.
A. carpel
B. petal
C. pollinator
D. stamen
E. ovule
Answer: D
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When experimenters replaced the statoliths in a crayfish statocyst with iron filings and then held a magnet above the animal, what did they observe? (answer based on your knowledge of the function of statoliths)
A. The crayfish stayed upright. B. The crayfish lay on its side. C. The crayfish turned upside down. D. The crayfish attempted to escape by rapidly swimming backwards. E. None of these choices are correct.
Quality control is set up on a new lot of an indole reagent. Clostridium bifermentans and Clostridium bolteae are used, and the following results are obtained: • C. bifermentans: positive • C. bolteae: negative Which one of the following statements explains this discrepancy?
a. The reagent is most likely expired. b. The incubation time is most likely abbre-viated. c. These two organisms are poor choices; both are indole-positive. d. No discrepancy is present. The results ob-tained are correct.
Which of the following statements about parasitic helminths is incorrect?
A. They are multicellular animals. B. They have a definitive host in which the adult form lives. C. They include roundworms and tapeworms. D. They have larval forms that do not affect humans.
Four of the five choices listed below are
characteristic of sclerenchyma cells. Select the exception. a. sclereid b. found in seed coats c. retain the ability to divide after differentiation d. gritty texture of pear cells e. used in manufacture of paper, textiles, and rope