Question

what is the main function of the rough endoplasmic reticulum in a plant
to help ribosomes make proteins
to produce steroid hormones
to give structure and organization to the cell
to direct cell activities by sending instructions to different parts of the cell

Explanation:

The rough endoplasmic reticulum has ribosomes attached to its surface and is involved in protein - synthesis. Steroid hormones are produced by smooth endoplasmic reticulum. The cytoskeleton gives structure and organization to the cell. The nucleus directs cell activities.

Answer:

to help ribosomes make proteins