Plants tissue + organs

• What is the purpose of the epidermal tissue?

  To protect surfaces and sometimes produce a waxy substance to keep the leaves waterproof.
• What is the purpose of palisade mesophyll?

  Contains lots of choloroplasts.
• What is the purpose of a spongy mesophyll?

  Contains some chloroplasts but have a large surface area to make the diffusion of gases easier.
• Xylem and phloem tissues transport ions throught the plant.
• What does xylem tissues transport?

  Water and mineral ions from the roots to the leaves.
• What do phloem tissues transport?

  Dissolved foods from the leaves to around the plant.
• Stomata opens to release water vapour which is known as transpiration
• Guard cells control how wide the stomata opens to let in carbon dioxide and let out water vapour.