Plants

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Plants
Characteristics

• Multicellular
• Eukaryotic
• Photosynthetic
• Cells have cell walls made of cellulose

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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)

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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

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Parenchyma

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

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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.

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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.

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Comparing Parenchyma and Collenchyma
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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.

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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.

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Comparing all three
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Vocabulary

• enchyma cellular tissue
• Ex parenchyma
• para beside
• coll glue
• scler hard

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Identify