Phil is conducting a seed germination experiment. He places three groups of lettuce seeds in a 34º Celsius incubator with adequate moisture. One set of seeds is placed in a dark area with no light source. A second set is placed under artificial light, and third set of seeds is placed in direct sunlight. This experiment is intended to test Phil's hypothesis that light is necessary for lettuce seed germination.Based on the experimental design, which variable was the control?
A. germination rate
B. moisture
C. type of light
D. temperature
E. seeds in the dark
Answer: E
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Carbon returns to the atmosphere
A. from respiration of plants. B. by the burning of fossil fuels. C. All of the answer choices are correct. D. from respiration of animals. E. as carbon dioxide.
Respond to statements 130–134 with reference to the five
vitamins listed below. a. Vitamin B1 b. Vitamin B2 c. Niacin d. Vitamin B6 e. Vitamin B12 D 130. This vitamin is a coenzyme involved in amino acid metabolism and is obtained from meats. D 131. This vitamin functions in connective tissue formation. M 132. This vitamin functions in coenzyme action. M 133. A deficiency of this vitamin causes pellagra. D 134. A deficiency of this vitamin causes pernicious anemia and neurological disorders.
Extensive growth of the streptococci in a thick bacterial layer on acidic glycoproteins on the teeth is called
A) dental plaque. B) dental caries. C) dental biofilm. D) periodontitis.
Nutrient deficient aquatic ecosystems are called ________.
A. hypotrophic B. oligotrophic C. eutrophic D. autotrophic E. epitrophic