Which of the Following Statements Best Summarises the Acid Growth

question 44

Multiple Choice

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

• A) Auxin stimulates proton pumps in the plasma membrane and tonoplast.
• B) Auxin-activated proton pumps lower the pH of the cell wall, which breaks bonds and makes the walls more flexible.
• C) Auxins and gibberellins together act as a lubricant to help stretch cellulose microfibrils.
• D) Auxins activate aquaporins that increase turgor pressure in the cells.

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