OBJECTIVE FORESTRY

Detailed explanation-1: -Both sieve cells and sieve tube members have parenchyma cells associated with them. Parenchyma cells associated with sieve cells are called albuminous cells; those associated with sieve tube members are called companion cells.

Detailed explanation-2: -The sieve tube is the conducting element of the phloem. It is formed from a vertical series of elongated cells, interconnected by perforations in their walls in areas known as sieve plates. The perforations may be restricted to smaller areas, sieve fields, several of which are contained in each sieve plate.

Detailed explanation-3: -In plant anatomy, sieve tube elements, also called sieve tube members, are a specialised type of elongated cell in the phloem tissue of flowering plants. The ends of these cells are connected with other sieve tube members, and together they constitute the sieve tube.

Detailed explanation-4: -Sieve cells are long elongated cells found in gymnosperms and other seedless vascular plants. Sieve tubes are short specialised cells that are found only in angiosperms. Morphology. Long cells with narrow pores. Short cells with wider pores.