companion cell.companion cellA type ofcellfound within thephloemof flowering plants. Eachcompanion cellis usuallyclosely associatedwith a sieve element.

answer is (c)Companion cellA type of cell found within thephloemof flowering plants. Each companion cell is usually closely associated with asieve element. Its function is uncertain, though it appears to regulate the activity of the adjacent sieve element and to take part in loading and unloading sugar into the sieve element. In gymnosperms a similar function is attributed toalbuminous cells, which are found closely associated with gymnosperm sieve elements.

Companion cellA type of cell found within thephloemof flowering plants. Each companion cell is usually closely associated with asieve element. Its function is uncertain, though it appears to regulate the activity of the adjacent sieve element and to take part in loading and unloading sugar into the sieve element. In gymnosperms a similar function is attributed toalbuminous cells, which are found closely associated with gymnosperm sieve elements.

The sieve cells and companion cells are two of the cells among the four cells of phloem the other two being phloem parenchyma and phloem fibres. The sieve cells do not have any nucleus and are regulated by the nucleus of companion cells for their regulations. Hence we can say companion cells are in association with sieve cells.Or C is therefore correct.