Plant tissue

• By the end of this video you should be able to describe the roles of the different tissues in a plant
• Photosynthesis takes place in leaves
• Leaf


  A plant organ
• Leaf


  • Contains different tissues
• Epidermal cells


  Form epidermal tissue at the top and bottom of the cell
• Upper epidermis


  Covers the top of the leaf
• Lower epidermis


  Covers the bottom of the leaf
• Epidermis


  • Protects the surface of the leaf
• Upper epidermis


  • Transparent, allows light to pass through
• Stomata


  Tiny pores in the lower epidermis, allow carbon dioxide in and oxygen out, help control water vapour loss
• Guard cells


  Found on either side of the stomata
• Palisade mesophyll


  Packed with chloroplasts, site of photosynthesis
• Spongy mesophyll


  Full of air spaces, allows gas exchange
• Xylem


  Transports water and dissolved mineral ions from roots to leaves
• Translocation


  Movement of sugars through phloem tissue
• Meristem tissue


  Contains stem cells that can differentiate into different plant tissues, found in growing tips