Life Cycle - Plants (2A)
Post Lab 

  • Distinguishing a tree from a flower.
  • Exploring the parts of trees and flowers.


  • flower
  • organ
  • plant
  • tree
  • worksheet
  • flower and tree cross sections (optional)

Students use a worksheet to determine the difference between a tree and flower.


A tree and a flower are  different. The word tree refers to the complete plant whereas a flower is only an organ of a plant. Some trees produce flowers (angiosperms, i.e., maple) and some do not (gymnosperms, i.e., pine). Flowers are usually grouped together on a stem and are adapted for sexual reproduction. The flower is not an entire  plant but an organ formed by some plants for reproductive purposes.

  1. Go over the parts of a flower.  
  1. stamen = the pollen producing organ of a flower consisting of a long filament and an anther
  2. petal = usually brightly colored with a distinct odor which serves to attract insects for cross-pollination (the transfer of pollen from one plant to another of the same type)
  3. pistil = the seed-bearing female reproductive organ
  4. sepal = one of the green segments forming the outer protective covering of a flower
  1. Go over the parts of a tree, which is a complete plant with many specialized organs and tissues. The picture on the worksheet represents a cross section of the woody tissue.
  1. bark = the wood covering of roots, stems and main trunks of trees and other wood plants
  2. phloem = the pathways through which food material is conducted throughout the plant (moves food)
  3. pith = the soft central portion of the branches and stems of plants
  4. annual growth rings = alternative light and dark concentric rings in tree branches and stems due to periods of growth between summer and winter
  5. xylem = the pathways through which water is conducted throughout the plant
  1. Go outside or bring flowers and parts of trees inside and have the students determine parts of a tree and flower.

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