Plant excretion

• Plant excretory organs


  Leaves and lenticels
• what do plants secrete?:

  • plants absorb water through their roots but lose it through their leaves (transpiration)
  • dermal tissue protects the plant and reduces water loss
  • the epidermis of stems and leaves have many holes called stomata which allow for gas exchange. O2 diffuses out through photosynthesis, and Co2 and H2o as they are by-products of respiration
  • water loss through the stomata is highest on hot, dry, windy days. plants that live in these conditions have thicker waxy layers
• trees and woody plants have lenticels, similar to stomata, in the bark. carbon dioxide and oxygen enter and leave through these lenticels.