AP BIOLOGY

Detailed explanation-1: -On a hot, dry day (or after several days with no rain or watering), transpiration causes more water to be lost than is coming in, and the water balance within the plant can get thrown off. The dehydrated collapsing cells in the leaves and stems can no longer remain erect, and the plant begins to wilt .

Detailed explanation-2: -So, the correct answer is ‘Cells wall is rigid and does not get overstretched’

Detailed explanation-3: -The cell wall provides mechanical support to the plant cell. When a plant cell is kept in a hypotonic solution, water enters the cell but it does not burst because of the pressure applied by the cell wall. Since it is rigid, it does not allow the cell to expand to an extent that it would burst.

Detailed explanation-4: -When water moves into a plant cell, the vacuole gets bigger, pushing the cell membrane against the cell wall. The force of this increases the turgor pressure within the cell making it firm or turgid . The pressure created by the cell wall stops too much water entering and prevents cell lysis.

Detailed explanation-5: -Plant cells have a strong cellulose cell wall outside the cell membrane. The cell wall is fully permeable to all molecules and supports the cell and stops it bursting when it gains water by osmosis. In pure water, the cell contents-the cytoplasm and vacuole-push against the cell wall and the cell becomes turgid .