One type of plant cell that has holes in it to allow substances to flow through is the phloem sieve tube member. These cells have pores or holes in their end walls called sieve plates, which enable the movement of dissolved sugars, amino acids, and other substances through the plant. The phloem cells form tubes through which these substances flow, facilitating transport within the plant. Additionally, plasmodesmata are microscopic channels that connect plant cells, allowing molecules and substances to move in and out of cells through holes in the cell walls. To summarize:
- Sieve tube members (phloem cells) have holes in their end walls (sieve plates) for substance flow.
- Plasmodesmata are channels through cell walls connecting plant cells for transport between cells.
The phloem sieve tube members are the most specific plant cell type noted for having holes that allow substances to flow through them in a controlled manner.
