- A Simple pores embedded within the cell wall that permit mainly passive, largely unregulated diffusion of small dissolved solutes during normal conditions
- B Cytoplasmic channels connecting adjacent plant cells through cell walls, enabling direct cell-to-cell communication and transport (symplast pathway)
- C A specialized membrane structure that surrounds and encloses the large central vacuole found within a typical mature plant cell as generally observed
- D Channels found mainly embedded within the plasma membrane itself, rarely spanning across the rigid surrounding cell wall structure in typical laboratory settings
Correct answer: B. Cytoplasmic channels connecting adjacent plant cells through cell walls, enabling direct cell-to-cell communication and transport (symplast pathway)
Explanation: Plasmodesmata are narrow cytoplasmic channels that pass through the cell walls connecting the cytoplasm of adjacent cells. They form the symplast pathway for transport of water, solutes, and signaling molecules. They also allow viral spread between cells.
Concept context
Internal tissue organisation: meristems, permanent tissues (xylem, phloem, parenchyma), and secondary growth. Frequently tested in NEET.