SSC MTS EXAM

Detailed explanation-1: -Plasmodesmata consists of channels between cell walls of adjacent plant cells for transport and cell to cell recognition. Structurally, the walls of sieve tubes tend to be dispersed with plasmodesmata grouped together and it is these areas of the tube walls and plasmodesmata that develop into sieve plates over time.

Detailed explanation-2: -So, the correct answer is ‘Companion cells.

Detailed explanation-3: -Parenchyma cells associated with sieve cells are called albuminous cells; those associated with sieve tube members are called companion cells.

Detailed explanation-4: -The phloem consists of sieve elements, companion cells, phloem parenchyma cells and phloem fibers. Other cell types may be found in the phloem of certain plant species. The functional units for long distance translocation and signal distribution are sieve tubes.