US National Weather Service Philadelphia September Weather data records that on September 28, 1984, the high temperature did not exceed 52 degrees Fahrenheit, the lowest high measured in Philadelphia in the past 69 years.
Vacuoles are generally used to store cell products or protect the rest of the cell from invading microorganisms. The large central vacuole of plant cells is a special case. It is used to store water and cellular wastes and helps maintain the necessary internal pressure of plants called turgor pressure. Structure.
The greatest concentration of water is outside the cell. Therefore, water enters the cell and fills the central vacuole, causing the contents of the plant cell to press against the cell wall. The plant cell swells and stiffens as turgor pressure increases.