Page 29 - Practical handout Lev 1-Pharm D- 2024-2025-with spec

Pharm D Level 1 Medicinal plants (PG 101)

Plant tissue definition: They are group of cells , which may be
1-Meristematic Tissue ( in which their cells are actively divided )and responsible for
growth of the plant

Or
2-Permanent Tissue (in which their cells loss
their activity for division)

Types of permanent plant tissues:
(1) Dermal tissues
(2) Ground tissues

(3) Vascular tissues (conducting tissue)
(4) Secretory tissues

1- Dermal ( Protective) Tissue

a- It's the outer protective covering of the plant.
b- It's represented by epidermis in the primary or young plant body then, it's replaced by

periderm in the secondary or old plant body.

Function :- protection of the plant

Character:- have large vacuoles , no intercellular spaces between them except only in
leaves & green stems where stomata occurred

The cells may be formed of isodiametric cells as in dicot plants.
Or formed of elongated cells as in monocot plants.

- Dermal tissue appendages
A- Stomata
B- Hairs or Trichomes

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