NEET BIOLOGY

Detailed explanation-1: -Its purpose is to keep an eye on the action of the sieve element adjacent to it and to help with the loading and unloading of sugar into it. Unlike angiosperms, gymnosperms do not have companion cells. They only have sieve cells for food conduction and albuminous cells that fulfill companion cell’s functions.

Detailed explanation-2: -Sieve tubes refer to a series of sieve tube elements placed end to end to form a continuous tube while companion cells refer to a specialized parenchyma cell, located in the phloem of flowering plants and closely associated in development and function with a sieve-tube element.

Detailed explanation-3: -Gymnosperms aren’t equipped with sieve tubes or companion cells.

Detailed explanation-4: -Sieve elements are formed by the Sieve tube and companion cells. These are associated with phloem parenchyma and transport mainly Sugar.