Which of the Following Statements Best Summarizes the Acid Growth

question 10

Multiple Choice

Which of the following statements best summarizes the acid growth hypothesis in an actively growing shoot?

• A) Auxin stimulates proton pumps in the tonoplast to pump hydrogen ions out of the vacuole and allow water to enter.
• B) Auxin-activated proton pumps lower the pH of the cell wall, which breaks hydrogen bonds and makes the walls more flexible.
• C) Auxins and gibberellins together act as a lubricant to allow cellulose microfibrils to slide past each other.
• D) Auxins activate aquaporins that increase turgor pressure in the cells forcing them to expand.

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