Passage VI
Most plants require specific substances known as minerals to grow and reproduce. The following table provides a list of the minerals essential to flowering plants and a description of their functions. The first seven listed are called macronutrients, since they are present in large quantities in the plants. The other minerals are called micronutrients because they are often present in trace amounts. The number of pounds of each mineral required to grow 100 bushels of corn is also depicted in the table.
Table adapted from William T.Keeton, Biological Science.©1980 by W. W. Norton & Company.
31. A botanist in South America found a new variety of corn identical to the type described in the table with the exception that it utilizes copper, instead of iron, in activating porphyrins. Approximately how many pounds of copper would you predict would be required to grow 100 bushels of this new corn?
Your Answer is
Correct Answer is B
Explanation
Replace iron with cooper, the demand for iron in the table is 2 lbs