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BIO NMDCAT CELL STRUCTURE & FUNCTION
nmdcat.online July 3, 2026

78. The structural feature known as a “pit” in mature, secondary plant cell walls represents a localized region where

A. The plasma membrane has ruptured completely
B. No secondary cell wall material was deposited, leaving only the primary wall
✓
C. Lignin has dissolved the middle lamella
D. Large centrioles are exported from the cell

📝 Explanation

Pits are thin depressions in the secondary wall where only the primary wall and middle lamella remain, allowing water to pass between cells.

📖 Additional Information

  • The plasma membrane has ruptured completely
  • No secondary cell wall material was deposited, leaving only the primary wall
  • Lignin has dissolved the middle lamella
  • Large centrioles are exported from the cell

Pits are thin depressions in the secondary wall where only the primary wall and middle lamella remain, allowing water to pass between cells.

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