What is a Tree? Learn about the functions & characteristics

Explain how a tree functions: roots take up water and nutrients; leaves photosynthesize to make sugars; sugars power maintenance, growth, reproduction, and defense.

Examine how bark protects against damage, heat, and water loss while allowing gas exchange; note variation in thickness, color, and shedding among species and environments.

Explain how most tree roots stay in the top 60 cm to access oxygen, and differentiate absorbing roots from anchoring roots, including mycorrhizal associations and lignin-based support.

Explore how stems and branches support trees and adapt to stress by balancing compression and tension. See how wind and gravity shape growth, energy storage, and water transport through xylem.

Leaves pull water and nutrients from the roots to produce energy in the form of starch, acting like solar panels while cooling the tree through evaporation.

Explore botany through vegetative reproduction, explaining how branches or roots can form new trees from cuttings, roots sprouting, and continuation after the main tree dies.

This lecture contrasts monocot palm apical growth with broadleaf growth at branch tips and thickening, explains growth rings as age cues and the outer living layer driving pruning.

Recognize that hollow trees are not necessarily bad, and that heartwood and sapwood with tannins and extractives slow decay, while cavities can host insects and fungus and enable nutrient recycling.

Clarify what a tree is and how leaves, bark, and branching patterns help identify trees, using false Ashoka, Samanea saman, and profile-based recognition as examples.