Meristematic Tissue and Plant Growth

Meristematic tissue is crucial for plant development. It is located in specific regions of a plant where active growth occurs, such as the tips of roots and shoots.

The primary reason meristematic tissue contributes to plant growth is the inherent characteristic of its cells: they possess the ability to undergo continuous cell division. This perpetual mitotic activity is fundamental for increasing the plant's size and developing new structures.

Mechanism of Growth via Meristems

• Cell Division: Meristematic cells are undifferentiated or incompletely differentiated cells. Their primary function is rapid and continuous division (mitosis).
• New Cell Production: Each division produces new cells. These cells contribute to the elongation of stems and roots (primary growth) and, in some cases, increase in girth (secondary growth).

Analysis of Other Options

• Thick Secondary Walls: Cells with thick secondary walls are typically mature, supportive, or vascular cells (e.g., xylem, sclerenchyma) and usually do not divide. Meristematic cells have thin primary walls.
• Large Central Vacuoles: Large central vacuoles are characteristic of mature, differentiated plant cells, helping maintain turgor pressure. Meristematic cells are typically small with dense cytoplasm and small vacuoles, facilitating rapid division.
• Permanent Differentiation: Differentiated cells are specialized for particular functions and have generally lost their capacity for division. Meristematic cells are actively dividing and are essentially undifferentiated precursors to specialized cells.