Question

Explain the structure and function of plasmodesmata with the help of a diagram ?

Answer 1

Plasmodesmata are cytoplasmic bridges between adjacent plant cells which develop in the minute pores of their walls. They form a protoplasmic continuum called symplast. Cell wall and intercellular spaces form a non-living component of the plant body called apoplasm. Plasmodesmata are 40-50 nm in diameter. It may be simple or branched.

They are lined by the plasma membrane. It encloses tubular extension of endoplasmic reticulum called desmotubule. The space between desmotubule and plasma membrane contains 8-10 microchannels. Plasmodesmata form channels for controlled passage of small-sized particles between adjacent cells as well as the transfer of some specific signals.