Explanation:

- Unorganized Sector: Often lacks job security. Workers may not receive consistent wages or benefits. Employment terms are usually informal.

- Agriculture Sector: Commonly part of the unorganized sector, especially in developing countries. It generally lacks job security due to fluctuating demand and climate conditions.

- Organized Sector: Typically provides higher job security. Jobs here come with formal agreements, benefits, and regulations that protect workers.

- Private Sector: Can include both organized and unorganized establishments. Job security depends on the nature of employment and the company's stability.