EVERYDAY SCIENCE

Detailed explanation-1: -The plant cell wall provides definite shape, strength, and rigidity. It also provides protection against mechanical stress and physical shocks. It helps to control cell expansion due to the intake of water. It helps in preventing water loss from the cell.

Detailed explanation-2: -Gravity resistance, mechanical resistance to the gravitational force, is a principal graviresponse in plants, comparable to gravitropism. The cell wall is responsible for the final step of gravity resistance.

Detailed explanation-3: -Though all eukaryotic cells have organelles, a nucleus, and a plasma membrane, only plants and fungi have cell walls. These walls provide rigidity and structure to their cells. While most animal cells are soft, requiring bones to give them structure, plants, and fungi get their structure from their cells’ walls.

Detailed explanation-4: -Gravity resistance is a principal graviresponse in plants. The cell wall is responsible for the final step of gravity resistance. The gravity signal increases the rigidity of the cell wall. Changes in cell wall metabolism and environment bring about the rigidity change.