AP BIOLOGY

Detailed explanation-1: -When the wilted leaves are placed in cold water then, it acts as a hypotonic solution. This leads to the inward diffusion of water molecules into the lettuce leaves. The leaves will become turgid and crisp due to the process of endosmosis.

Detailed explanation-2: -A student noticed that placing wilted lettuce in a bowl of cool water caused the lettuce to become more crisp and firm. What is the best explanation for his observation? Water moved into the lettuce cells by osmosis. This solution has the equal concentrations of water molecules and particles.

Detailed explanation-3: -Osmosis occurs when you put salad dressing on a salad. Because the dressing has a very low water concentration, water from the lettuce diffuses from the cells into the surroundings. Salad that has been “dressed” too long becomes limp and unappetizing (table 4.1).

Detailed explanation-4: -Lettuce and leafy greens are composed primarily of water. Wilting is a sign of dehydration, so submerging in water allows the dehydrated cells to absorb much needed moisture. As the cells take on more water, they will become more turgid and rigid, giving the lettuce its original study and crisp shape.

Detailed explanation-5: -Passive transport is a naturally occurring phenomenon and does not require the cell to expend energy to accomplish the movement. In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion.