Plants - PowerPoint PPT Presentation

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Plants

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Plants Characteristics: Multicellular Eukaryotic Photosynthetic Cells have cell walls made of cellulose 2 Categories of Plants: Non-vascular: Does not have true stems ... – PowerPoint PPT presentation

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Title: Plants


1
Plants
Characteristics
  • Multicellular
  • Eukaryotic
  • Photosynthetic
  • Cells have cell walls made of cellulose


2
2 Categories of Plants
  • Non-vascular
  • Does not have true
  • stems, roots and leaves.
  • Does not have xylem and phloem
  • Vascular
  • Have true stems, roots
  • and leaves.
  • Have xylem and phloem
  • (Vascular tissue)

3
Cell Types in Plants
  • Parenchyma, collenchyma, and sclerenchyma
  • Parenchyma
  • Functions
  • Conduct photosynthesis
  • Stores starch, oils, and water for the plant.
  • Also important for healing wounds of the plant

4
Parenchyma
  • Details Thin cell walls and large water-filled
    vacuoles in the middle. Most common type of cell
    in plants

5
Collenchyma
  • Functions
  • Provide support for the plant, while still
    allowing it to grow.
  • They are flexible.
  • EX As a young leaf grows, collenchyma cells can
    elongate, giving the leaf structure.
  • Do not conduct photosynthesis.

6
Collenchyma
  • Details
  • Most common in the younger tissues of leaves and
    shoots
  • Cell walls range from thick to thin.
  • Often form into strands. EX celery strings
  • Cells walls do not contain lignin, so they are
    stretchy and can change size.

7
Comparing Parenchyma and Collenchyma
8
Sclerenchyma
  • Functions
  • Found in parts of the plant that are no longer
    growing.
  • Skeletal support for water-conducting tissues and
    the plant itself.
  • These cell fibers are used to make linen and
    rope.
  • Form a major part of fruit pits and hard outer
    shells of nuts.

9
Sclerenchyma
  • Details
  • This is the strongest cell type of the three
  • Have a second cell wall that is hardened by
    lignin.
  • Makes the cells very tough, durable, and rigid.
  • These cells are not able to grow with the plant.

10
Comparing all three
11
Vocabulary
  • enchyma cellular tissue
  • Ex parenchyma
  • para beside
  • coll glue
  • scler hard

12
Identify
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