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Plant cells change shape by changing the amount of ________ in them, resulting in swelling or shrinking, and therefore in changing shapes.
chlorophyll
fat
water
carbon dioxide
water
Plant cells change their shape and volume primarily by regulating the amount of water within their vacuoles. This process, known as osmosis, causes cells to swell (turgid) or shrink (flaccid), which is essential for maintaining plant structure, opening stomata, and facilitating plant movement.
Plant cells change their shape and volume primarily by regulating the amount of water within their vacuoles. This process, known as osmosis, causes cells to swell (turgid) or shrink (flaccid), which is essential for maintaining plant structure, opening stomata, and facilitating plant movement.
Think of a balloon inside a rigid box; as you fill the balloon with water, it presses against the walls of the box and becomes firm and structural, just like a turgid plant cell.
╬иwтАЛ=╬иsтАЛ+╬иpтАЛ тАФ The water potential equation where ╬иwтАЛ is water potential, ╬иsтАЛ is solute potential, and ╬иpтАЛ is pressure potential.
The principle relies on turgor pressure. When water enters the vacuole via osmosis, the cell expands and pushes against the rigid cell wall, creating high turgor pressure that makes the cell turgid. Conversely, when water leaves the cell, turgor pressure drops, the cell membrane pulls away from the cell wall (plasmolysis), and the cell becomes flaccid, leading to shrinkage or wilting.
Plant cell shape is governed by turgor pressure generated by the central vacuole.
Osmosis is the movement of water across a semi-permeable membrane from an area of low solute concentration to high solute concentration.
Rigid cell walls prevent the cell from bursting when fully turgid.
Guard cells around stomata use water changes to open and close pores.
Provides structural support to non-woody plants.
Enables physiological responses like stomatal movement.
Plants lose structural integrity (wilt) under water stress.
Regulation of stomatal aperture for gas exchange.
Maintaining upright posture in herbaceous plants.
Turgor pressure is the force exerted by the cell wall against the incoming water.
Option A (chlorophyll) is for photosynthesis; Option B (fat) is for energy storage; Option D (carbon dioxide) is a reactant in photosynthesis.
C is correct тАФ Plant cells change shape by changing the amount of water in them.
Remember: High water content = High turgor pressure = Turgid/Firm cell. Low water content = Low turgor pressure = Flaccid/Wilted cell.
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