priyaprawin

BIOL 219, Exam #2, Fall 2017 1. When tropical forests are cut for agricuiture, they often do not produce highly productive crop growth. What is probably limiting the growth of a crop in the tropical forest A. Sunlight. B. Rainfall. C. Carbon dioxide D. Soll nutrients. E. Bacteria. 2. Hydroponic culture is the process of A Growing plants in pure water mixed with carefully measured amounts of specfic minerals. B. Irrigation of dry areas to improve mineral absorption by plants C. Growing plants in ponds and lakes to improve their access to water, allowing the plants to place more resources into the shoot system. D. Irrigation of dry areas to prevent crop plants from wilting E. Growing plants with specific hydrocarbons added to the soil to test the effect on plant growth. 3. Which of the following statements about essential elements is FALSE? An element with only one role in plant metabolism may still be essential. B. A. An essential element is necessary for normal growth and reproduction. c. Plant seeds in some cases contain enough of an essential element to sustain the adult D. An essential element may occasionally be functionally replaced by another element. E. Some essential elements are required in only trace amounts. plant. 4. A common consequence of nutrient deficiencies in plants is chlorosis, which is A. Wilting due to a lack of chlorine in leaves. B. Death of the growing tips. C. Premature loss of leaves D. Bursting of cells from excess water uptake due to an inability to clear chlorine from them. E. Yellowing of plant tissues due to a lack of chlorophyll. 5. Soil particles that are decomposing organic matter are called A. Sand. B. Humus C. Silt. E. Mineral. Which soil region extends to the underlying bedrock, and consists of mineral particles and rock fragments but generally no organic material? 6. D. D horizon E. O horizon A. A horizon B. B horizon C. C horizorn