a pear tree's fruit fails to ripen each year. a scientist discovers that the tree does not produce enough of one major plant hormone. which hormone is the tree lacking?

The correct answer is "The rates of ATP production and carbon dioxide production would both increase".

Explanation:

The citric acid cycle, or the Krebs cycle, is the name given to a series of reactions used by all aerobic organisms for the release of stored energy from a wide range of sources, including: carbohydrates, fats, and proteins. The end product of the citric acid cycle is adenosine triphosphate (ATP), obtaining two ATP molecules per glucose, as well as two molecules each of carbon dioxide and water. Therefore, if one of the eight intermediates of the citric acid cycle are added to the culture medium of a yeast growing, the expected result will be to enhance the use of this cycle by the yeast, and the rates of ATP production and carbon dioxide production would both increase.