What is the function of a central vacuole

The central vacuole is a cellular organelle found in plant cells. It is often the largest organelle in the cell. It is surrounded by a membrane and functions to hold materials and wastes. It also functions to maintain the proper pressure within the plant cells to provide structure and support for the growing plant. (wiki.com) Hope this helps Hon!!

Leo is suffering from a condition known as obsessive-compulsive disorder.

Explanation:

The obsessive-compulsive disorder refers to an anxiety problem characterized by intrusive, recurrent and persistent thoughts that might produce worry, concern, and repetitive actions or behavior, known as compulsions. These compulsions are directed to reduce the associated anxiety and to avoid that something bad occurs.

A pattern of thoughts and irrational fears -obsessions- that make the patient behave with repetitive actions -compulsions-, characterize this disorder.

These obsessions and compulsions interfere in daily activities and are the cause of anxiety and distress.

This disorder is expressed by different symptoms,  such as obsessive cleaning, washing, ordering, accumulating, among others. The exposed example is the case of a verifying person who needs to verify everything to avoid a catastrophe. They need to check that doors are closed, or electro domestics are in their off mode.