Plants

Characteristics:

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

2 Categories of Plants:

Non-vascular:•Does not have true stems, roots and leaves.•Does not have xylem and phloem

Vascular:•Have true stems, rootsand leaves.•Have xylem and phloem(Vascular tissue)

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

Parenchyma

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

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.

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.

Comparing Parenchyma and Collenchyma

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.

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.

Comparing all three

Vocabulary enchyma: cellular tissue

Ex: parenchyma para: beside

coll: glue scler: hard

Identify: