In Sunny, Hot Weather, Corn, Which Is a C₄ Plant

question 176

Multiple Choice

In sunny, hot weather, corn, which is a C₄ plant, has a survival advantage over wheat, which is a C₃ plant, because

• A) wheat loses water through its stomata and corn does not.
• B) wheat is less efficient in its use of ATP than corn is.
• C) corn undergoes photorespiration and wheat does not.
• D) corn is able to keep its stomata open and wheat cannot.
• E) corn keeps CO₂ levels high around rubisco even when stomata are closed.

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Definitions:

Plasmolysis

The process in which cells lose water in a hypertonic solution, resulting in the shrinkage of the cell membrane away from the cell wall.

Hypertonic

A solution that has a higher concentration of solutes compared to another solution, leading to potential osmotic movement of water out of a cell.

Extracellular Fluid

Fluid that exists outside the cells of an organism, including blood plasma, lymph, and interstitial fluid, providing a medium for transport of nutrients and waste.

Solute Concentration

The amount of a substance dissolved in a unit volume of solution, often referred to in terms of molarity, molality, or mass percent.