plant cell organisation

• where in the leaf are stomata found

  stomata are found in the lower epidermis
• what is meristem tissue

  meristem tissue is made up of plant stem cells
• where is the meristem tissue found

  in the growing tips of shoots and roots
• which structures help to minimise water loss

  • waxy cuticle which is impermeable to water
  • guard cells which can close stomata
• why is the upper epidermis transparent

  to allow light to pass through and reach the palisade mesophyll cells - which is where photosynthesis happens
• is the leaf an organ system, organ, tissue, or cell

  the leaf is an organ
• in the spongy mesophyll an organ system, organ, tissue, or cell

  the spongy mesophyll is a tissue
• is a guard cell an organ system, organ, tissue, or cell

  a guard cell is a cell
• why does the spongy mesophyll layer have so many air gaps

  to allow carbon dioxide to diffuse from the stomata to the palisade mesophyll cells
• how does the level of water in the plant affect the opening and closing of stomata

  • when there is plenty of water in the plant, the guard cells become turgid, which open the stomata
  • when there is not very much water in the plant, the guard cells become flaccid, which closes the stomata