How do cells..............?

Please expain how do cells of plants, fungi, and bacteria withstand very dilute external media such as hypotonic without bursting?

Comments

  • All plant,fungi,bacteria have cell wall made from cellulose,hemicellulose and pectin which gives it its strength but unstretchable.

    When the plant cell is put in hypotonic media, water moves but Osmosis from high water potential in the solution to low water potential in the cell. The water entering will create turgor pressure on cell wall which is unstretchable so water can no more enter so no bursting.

    Fungi and bacteria does the same.

  • Plants, most fungi, most bacteria have rigid cell walls. It is important to note that they also have a plasma membrane that in the case of bacteria is part of the cell wall. In a hypotonic medium (low solutes) water will enter a cell due to osmotic pressure. The rigid cell wall in plants, fungi and bacteria will maintain the shape of the cell and won't allow expansion of the structural portion of the cell wall. However, continued exposure to a hypotonic solution will cause the cell plasma membrane to disintegrate due to internal osmotic pressure and the cell will burst, but will leave the rigid cell wall structure remaining. So, the cell wall structure can remain, but the cells can burst and lose their contents. The cell wall in plants will withstand tremendous exposure to hypotonic solution (for example, lots of rain in a short timeframe). The cell wall in plants is made primarily of cellulose, in bacteria, it is a peptidoglycan layer, in fungi the cell wall is composed of various types of glucans.

  • the plant cell have a rigid cell wall around them which helps them to withstand the force exerted by hypotonic solutions whereas in animal cells, they lack cell wall , therefore they burst out when large pressure is exerted.

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