Question

The concentration of a number of ions and other materials is higher in vacuoles than those in cytoplasm - why?

• A. Tonoplast has a number of active transport system that pumps ions into vacuole from cytoplasm
• B. Through osmosis, a large amount of ions go continuously to vacuole from cytoplasm
• C. Cytoplasmic ions enter the vacuole through osmotic flow of water
• D. Vacuole is always engaged in the hydrolysis of salts into their ions

Answer 1

Answer: (A)

In plants, the tonoplast facilitates the active transport of a number of ions and other materials against concentration gradients into the vacuole. Hence, the ions and other materials are present in a concentration which is significantly higher in the vacuole than in the cytoplasm.