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Which structure is present in plant cells but absent in animal cells?
Cell wall
Mitochondria
Endoplasmic reticulum
Cytoplasm
Cell wall
The cell wall is a rigid, non-living outer layer composed primarily of cellulose that provides structural support and protection to plant cells. It is absent in animal cells, which are bounded only by a flexible plasma membrane.
The cell wall is a rigid, non-living outer layer composed primarily of cellulose that provides structural support and protection to plant cells. It is absent in animal cells, which are bounded only by a flexible plasma membrane.
Think of the cell wall as the brick-and-mortar skeleton of a building, providing shape and stability, whereas animal cells are like water-filled balloons that rely on their surroundings for support.
CW-Plant (Cell Wall for Plants): 'Plants are rigid like a wall, animals are flexible and small (at the cell level).'
C6тАЛH10тАЛO5тАЛ тАФ The repeating unit of cellulose, the structural polysaccharide forming the cell wall.
The plant cell wall consists of a primary wall and a secondary wall composed of cellulose microfibrils, hemicellulose, and pectin. These molecules form a cross-linked network that maintains turgor pressure, defined by ╬и=╬иsтАЛ+╬иpтАЛ, where ╬и is water potential, ╬иsтАЛ is solute potential, and ╬иpтАЛ is pressure potential.
The cell wall provides mechanical strength and prevents osmotic lysis in hypotonic environments.
Animal cells lack a cell wall, allowing for cell motility and specialized tissue formation.
Plant cells use plasmodesmata to communicate through the cell wall.
Cellulose is the most abundant organic polymer on Earth.
Provides structural rigidity and support for plant growth against gravity.
Acts as a physical barrier against pathogens.
Limits the mobility of cells, restricting organisms to stationary growth.
Requires high energy for synthesis during every cell division.
Cellulose fibers used in paper and textile industries.
Dietary fiber in human nutrition consists primarily of plant cell wall components.
| Feature | Plant Cell | Animal Cell |
|---|---|---|
Outer boundary | Cell wall | Plasma membrane |
Option B (Mitochondria) is the 'powerhouse of the cell' found in both plants and animals.
Option C (Endoplasmic reticulum) is a membrane-bound organelle involved in protein synthesis found in eukaryotes (both plants and animals).
Option D (Cytoplasm) is the jelly-like substance where organelles are suspended, common to all cell types.
A is correct тАФ The cell wall is a unique structural feature of plant cells that provides rigid support and protection, which is not found in animal cells.
In competitive exams, always differentiate between organelles found in all eukaryotes vs. those specific to plants (like chloroplasts and large vacuoles) or animals (like centrioles).
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