Dicotyledonous Plants

• why do plants need carbon dioxide?

  for photosynthesis
• what does photosynthesis produce as a waste gas?

  oxygen
• why do plants need oxygen?

  for respiration
• what does respiration produce as a waste gas?

  carbon dioxide
• what is the main gas exchange surface?

  the surface of the mesophyll cells in the leaf
• how are the mesophyll cells in the leaf well adapted to their function?

  they have a large surface area
• where are the mesophyll cells?

  inside the leaf
• what do gases move in and out of the cells through?

  special pores in the epidermis called stomata
• what is the singular of stomata?

  stoma
• what can the stomata do?

  open to allow exchange of gases , and can CLOSE if the plant is losing too much water
• what control the opening and closing of stomata?

  guard cells