Answer: Entry of water into vacuole by osmosis.
- A Active transport of ions across the plasma membrane
- B Entry of water into vacuole by osmosis
- C Cell wall rigidity resisting outward expansion
- D ATP hydrolysis powering membrane pumps
Correct answer: B. Entry of water into vacuole by osmosis
Explanation: Water enters the vacuole by osmosis, pushing the cell membrane against the rigid cell wall. This creates turgor pressure.
Animal cell structure with major organelles labeled. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Cell theory, prokaryotic vs eukaryotic cells, organelles and their functions. Foundation of all biology.