Productivity and Yield of Cultivated Crops Are Often Reduced by Insect

question 223

Multiple Choice

Productivity and yield of cultivated crops are often reduced by insect pests. The following graph shows the relationship between the yield of a certain crop, f(x) , as a function of the density of aphids x. (Aphids are small insects that suck plant juices.) Here, f(x) is measured in kilograms/ 4,000 square meters, and x is measured in hundreds of aphids/bean stem. By computing the slopes of the respective tangent lines, estimate the rate of change of the crop yield with respect to the density of aphids when that density is 200 aphids/bean stem and when it is 800 aphids/bean stem. ​ ​

• A) - 0.5 when it is 200 aphids/bean stem, - 1.333 when it is 800 aphids/bean stem
• B) 00.5 when it is 200 aphids/bean stem, 01.333 when it is 800 aphids/bean stem
• C) 02 when it is 200 aphids/bean stem, 00.75 when it is 800 aphids/bean stem
• D) - 2 when it is 200 aphids/bean stem, - 0.75 when it is 800 aphids/bean stem

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Definitions:

Myoglobinuria

The presence of myoglobin in the urine; can be caused by injured or damaged muscle tissue.

Phenylalanine

An essential amino acid that cannot be produced by the body and must be obtained from the diet, used in the biosynthesis of proteins.

Phenylketonuria

A genetic disorder characterized by the body's inability to break down the amino acid phenylalanine, requiring dietary restrictions from early life.

Genetic Disorder

A disease or condition caused by abnormalities in an individual's genome; can be inherited or result from a new mutation.