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Possible functions of stems : Supports leaves, flowers, and fruits Ex. Tree branches Conducts water, nutrients and products of photosynthesis to other parts of the plant. Ex. Xylem and phloem in the stem. Stems. Functions continue…. Can store water Ex: cacti.
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Possible functions of stems: • Supports leaves, flowers, and fruits • Ex. Tree branches • Conducts water, nutrients and products of photosynthesis to other parts of the plant. • Ex. Xylem and phloem in the stem Stems
Functions continue… • Can store water Ex: cacti
Can be responsible for asexual reproduction. Ex. Stem cuttings
What is the meaning of herbaceous? Having a soft, green stem
The meristem is responsible for continued growth of the plant. Stem Growth
Growth in length Primary Growth
Growth in width or diameter Stem Secondary Growth
Secondary growth is responsible for tree ring formation. Stem Secondary Growth
Tree rings form due to growth that takes place during the year. Lighter color due to growth during Spring – favorable conditions Darker color due to growth during the summer – conditions less favorable Tree Rings
The lighter color in a tree ring is known as earlywood. • It is produced early in the season. • Darker color is known as latewood or summer wood. Produced late in the season Tree Rings
Scar from forest fire Early wood (Lighter ring) First year growth (pith) Rainy season (Rings far apart) (Rings far apart) Late wood Dry season (Rings close together) (Rings close together) (Darker ring) Early wood + Late wood = Tree ring