Why onion leaf becomes springly and firm when we add water

Explanation:

Onions and their close relatives–chives, garlic, shallots, and leeks–are among the oldest of home garden plants. Allium is the genus for these crops. All varieties of Allium require loose, well-drained soil rich in nitrogen.

There are hundreds of varieties of onion family plants. All suffer from similar pest, disease, and cultural problems

materials water oxygen those are the things i can think of in this moment.