Question

what is the main function of the smooth endoplasmic reticulum in a plant cell? to package proteins and other substances and send them to different parts of the cell to break down sugar and release energy that the cell can use to produce steroid hormones to use energy from sunlight to make sugar

Explanation:

The smooth endoplasmic reticulum is involved in lipid synthesis including steroid - hormone production in some cells. Packaging proteins is the function of the Golgi apparatus. Breaking down sugar for energy is done by mitochondria. Using sunlight to make sugar is the function of chloroplasts.

Answer:

to produce steroid hormones