Explanation:

• A reverse osmosis membrane is a semi-permeable membrane that allows the passage of water molecules but not the majority of dissolved salts, organics, bacteria and pyrogens.
• Osmosis is a naturally occurring phenomenon and one of the most important processes in nature. It is a process where a weaker saline solution will tend to migrate to a strong saline solution. Whereas Osmosis occurs naturally without energy required, to reverse the process of osmosis one needs to apply energy to the more saline solution.

Hence only statement 1st is correct.