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Which type of cell typically contains a large central vacuole?
Animal cell
Bacterial cell
Plant cell
Viral cell
Plant cell
Plant cells contain a large central vacuole, which acts as a storage sac and plays a critical role in maintaining cell structure. This organelle occupies up to 90% of the cell's volume in mature plants, pushing the cytoplasm and nucleus against the cell wall.
Plant cells contain a large central vacuole, which acts as a storage sac and plays a critical role in maintaining cell structure. This organelle occupies up to 90% of the cell's volume in mature plants, pushing the cytoplasm and nucleus against the cell wall.
Think of the central vacuole like a water-filled balloon inside a rigid cardboard box; the pressure of the water (turgor) keeps the box sturdy and prevents it from collapsing.
VACU-OLE: V-ery A-bundant C-entral U-nit, O-ften L-arge E-nclosure.
╬а=iCRT тАФ where ╬а is osmotic pressure, i is the Van't Hoff factor, C is molar concentration, R is the gas constant, and T is temperature.
The large central vacuole is enclosed by a specialized membrane called the tonoplast. It maintains turgor pressure by regulating the osmotic concentration of cell sap, often accumulating solutes to draw water in via osmosis, which exerts physical pressure against the rigid cell wall to keep the plant upright.
The central vacuole is surrounded by a membrane known as the tonoplast.
It stores nutrients, waste products, water, and pigments (like anthocyanins).
Turgor pressure generated by the vacuole is essential for the structural rigidity of non-woody plants.
It helps in the detoxification and sequestering of secondary metabolites.
Maintains cellular turgor for structural support
Acts as a reservoir for essential nutrients and ions
Facilitates rapid cell elongation without synthesizing massive amounts of cytoplasm
Requires metabolic energy to maintain active transport of solutes across the tonoplast
Plant structural stability
Storage of reserve proteins in seeds
Pigmentation of flowers to attract pollinators
| Feature | Animal Cell | Plant Cell |
|---|---|---|
Vacuole Presence | Small, temporary, or absent | Large, permanent, central |
Animal cells may contain small, transient vacuoles, but they lack the large, permanent central vacuole found in plants.
Bacteria and viruses are prokaryotic and acellular respectively; they do not contain membrane-bound organelles like true vacuoles.
The central vacuole is a defining feature distinguishing plant cells from animal cells under a light microscope.
C is correct тАФ Plant cells possess a large, central, membrane-bound organelle called the vacuole that regulates turgor pressure.
In competitive exams, always remember that membrane-bound organelles like vacuoles, chloroplasts, and mitochondria are absent in bacteria (prokaryotes).