CELL SPECIFICITIES, LOCATIONS, AND FUNCTIONS OF PLANT TISSUES SIMPLE

SIMPLE TISSUE

MERISTEMATIC

1.    Apical Meristem

Found in tips of roots and shoots.

a.  Responsible for an increase in length (primary growth).

2. Lateral Meristem

(Vascular cambium and Cork cambium)

a.     Found on the lateral sides of roots and shoots.

b.     Responsible for an increase in width

(secondary growth).

• Cells with thick cytoplasm, large nucleus, and thin walls • Have the ability to divide • Responsible for growth and repair

PERMANENT: Different shapes and sizes

• Cannot divide

• Responsible for different functions

1. Epidermal Tissue

a. Single layer of epidermal cells.

b. Cover the plant body.

c. Responsible for protection and absorption.

2. Ground Tissue

a. Made of parenchyma cells with large vacuoles.

b. Found in all parts of plant body

c. Responsible for photosynthesis (in leaves) and respiration and protein synthesis (in other parts)

3. Support Tissue Collenchyma

a. Made of long cells with unevenly thickened primary walls.

b. Found beneath the epidermis and in midribs.

c. Responsible for support in plant parts. Sclerenchyma

a. Made of rigid cells with thick secondary walls.

b. Fiber cells found in xylem and phloem; Sclerite cells found in seed coats.

c. Responsible for support, strength, and transport.

COMPOUND TISSUES XYLEM

XYLEM AND PHLOEM TISSUE

1.    Xylem Tissue

a.    Responsible for the transport of water and

support

b. Vessel Elements

c. Short, hollow and dead cells with thick walls, join to form long tubes.

Tracheids

a. Long, slender cells, with thick walls.

2. Phloem Tissue

a. Responsible for the conduction of food.

Sieve Tube Cells

a. Long cells with sieve plates at end walls, join to form long pipelines (sieve tubes).

Companion Cells

a. Make proteins for sieve tube cells.