Cell as a Physiological Unit:
Living organisms are built up of functional and structural units termed as cells. Every cell is made up of numerous organelles and biomolecules. The organelles are membrane-bound structures included in particular functions. The organelles are not present in prokaryotic cells; still a prokaryotic cell can also carry out all the physiological functions needed for its metabolism.
The plant cell can be termed to as a physiological unit as it has the capabilities of carrying out all physiological functions as a single entity.
Cell wall is a non-living outer restrictive layer of the plant cell that gives shape and firmness to the cell.
The cell wall is followed by the cell membrane or plasma membrane which is selectively permeable included in the absorption of water by osmosis, and other substances such as ions and low molecular weight biomolecules.
The protoplasm that is the physical basis of life involves cytoplasm, nucleus and cellular organelles that are included in different physiological phenomena occurring in the cell. The protoplasm is a water retentive colloid having 90% of water that is a universal solvent.
Plant cells are characterized by a prominent vacuole having cell sap and functioning as an osmo-regulatory organelle of the cell.
The cell is the main seat of metabolic events.
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