Tissues in Leaves
The leaf is a plant organ that contains different tissues
Upper and Lower Epidermis
- Layer of very thin cells
- Protects surface of leaf
- Transparent to allow light to pass through
- Covered with waxy cuticle to reduce evaporation of water
Stomata
- Pores in lower epidermis which allow carbon dioxide to enter the leaf and oxygen to leave.
- Also control water vapour
Guard Cells
- On either side of stomata are and open and close stomata
Palisade Mesophyll
- Contains lots of palisade cells which contain lots of chloroplast for photosynthesis
Spongy Mesophyll
- Full of air spaces allow carbon dioxide to diffuse from stomata through spongy mesophyll to palisade cells, oxygen diffuses from palisade through spongy mesophyll to stomata
Xylem
- Transports water from roots to the stem and leaves some of which is used in photo synthesise, transports dissolved mineral ions
Phloem
- Transport dissolved sugars produced by photosynthesis from leaves to the rest of the plant
- Sugars are used in multiple ways
Meristem Tissue
- Found in growing tips
- Contains Stem Cells