Organic Substances:
* Cellulose: The most abundant organic compound in trees, forming the rigid cell walls that give trees their structure.
* Hemicellulose: Another structural polysaccharide, working alongside cellulose to provide strength and flexibility.
* Lignin: A complex polymer that adds rigidity and strength to wood, making it resistant to decay.
* Suberin: Found in the bark, suberin helps to waterproof the tree and protect it from disease.
* Resins: These sticky substances protect the tree from insects, fungi, and other threats. They also contribute to the unique scent of some trees.
* Tannins: These compounds give wood its color and help to protect it from decay.
* Sugars: Simple sugars are transported through the tree, providing energy for growth and other processes.
* Starches: Complex carbohydrates stored as energy reserves.
* Proteins: Essential for growth and development.
* Lipids (fats and oils): Provide energy storage and insulation.
Inorganic Substances:
* Water: Makes up a large percentage of a tree's weight, essential for photosynthesis and transport.
* Minerals: Trees absorb minerals from the soil through their roots, essential for growth and development. These include:
* Nitrogen: Essential for chlorophyll production.
* Phosphorus: Crucial for energy production.
* Potassium: Helps with water regulation.
* Calcium: Strengthens cell walls.
* Magnesium: Important for chlorophyll production.
* Iron: Involved in photosynthesis.
* Sulfur: Needed for protein synthesis.
Other:
* Air: The spaces between tree cells are filled with air, allowing for gas exchange.
The specific composition of these substances varies between tree species and even within different parts of the same tree. This intricate combination of organic and inorganic components creates the complex and resilient structure we recognize as a tree.
