Importance of Water in Life
1. Chemical Nature of Water
Water is a compound made up of hydrogen and oxygen, with the chemical formula H₂O.
That means each water molecule is made of 2 hydrogen atoms and 1 oxygen atom.
Even though this seems simple, water is not ordinary—it has unique properties that make it essential for life. That’s why scientists call water the “medium of life”—everything in living organisms happens either in water or with the help of water.
2. Water Content in Living Organisms
- About 2/3 (around 70%) of the human body is made up of water.
- Every living organism contains water.
- Water content can range from 65% to 89% in different organisms.
Tissue-Specific Water Content
Not every tissue in our body has the same amount of water.
Let’s look at some examples:
- Bone cells: ~20% water (because bones are hard and dense)
- Brain cells: ~85% water (brain is soft and highly active)
👉 So, soft and active tissues like the brain have more water, while hard tissues like bones have less.
3. Role of Water in Life
Water helps in two main ways:
- Building and maintaining protoplasm
- Protoplasm is the living content of the cell—think of it as the jelly-like material where all cell functions happen.
- Water keeps the structure and fluidity of protoplasm.
- Providing the right environment for life
- Water dissolves nutrients, helps in chemical reactions, and maintains temperature.