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Which of the following is absent in cells of meristematic tissue?
Cytoplasm
Cell walls
Vacuoles
Nuclei
Vacuoles
Meristematic tissues consist of actively dividing, immature cells characterized by small size, dense cytoplasm, and thin cell walls. Unlike mature plant cells that often contain large central vacuoles for storage and structural support, meristematic cells have little to no vacuoles because their primary function is rapid mitotic cell division.
Meristematic tissues consist of actively dividing, immature cells characterized by small size, dense cytoplasm, and thin cell walls. Unlike mature plant cells that often contain large central vacuoles for storage and structural support, meristematic cells have little to no vacuoles because their primary function is rapid mitotic cell division.
Think of a construction site: a storage warehouse (large vacuole) is built only after the structure is framed and finished. During the active building phase (cell division), every square inch of the site must be clear of storage containers to allow workers (organelles) to move and build freely.
In meristematic cells, the energy and space are dedicated entirely to the cell cycle. The absence of a large, mature vacuole allows for a higher nucleo-cytoplasmic ratio and facilitates the rapid reorganization of the cytoskeleton required for mitosis. When these cells mature and differentiate, they eventually develop large central vacuoles and lose their ability to divide.
Meristematic cells are characterized by dense cytoplasm and prominent nuclei.
The absence of a central vacuole is a key diagnostic feature of meristematic tissues.
Cell division requires metabolic efficiency which is hindered by the structural constraints of large vacuoles.
Once cells develop a large vacuole, they transition from a meristematic state to a permanent/differentiated state.
Growth in root and shoot tips.
Secondary growth in vascular cambium.
| Feature | Meristematic | Permanent Cell |
|---|---|---|
Vacuole Size | Absent/Very Small | Large (Central) |
Meristematic tissue is found in regions of active plant growth.
Option A (Cytoplasm) is present and dense to support high metabolic activity.
Option B (Cell walls) are thin and primary in nature to allow cell expansion.
Option D (Nuclei) are large and prominent to control active cell division.
C is correct тАФ Vacuoles are typically absent or extremely small in meristematic cells to provide space for active cell division.
Always remember that 'active division' in biology implies a need for high energy, dense cytoplasm, and a lack of bulky storage structures like large vacuoles.
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