Carbon dioxide enters plants mainly through the...
  • roots
  • leaves
  • flowers
  • stem
Exchange surfaces are usually very...
  • thin
  • thick
  • wide
  • tall
In animals, uptake of materials is quicker if there is a rich network of...
  • capillaries
  • villi
  • lungs
  • arteries
Exchange surfaces are generally involved in the...
  • transfer of materials across a membrane
  • removal of waste
  • uptake of nutrients
  • respiration
Mineral ions enter the plant by active transport through the...
  • stem
  • leaves
  • roots
  • flowers
Diffusion is faster across an exchange surface if the concentration gradient is...
  • less
  • increased
  • the same
  • moved
During gaseous exchange, which two gasses are involved?
  • Oxygen and hydrogen
  • Nitrogen and oxygen
  • Carbon dioxide and oxygen
  • Ammonia and oxygen
These are found in large numbers in the lining of the small intestine.
  • Alveoli
  • Ville
  • Villi
  • Arteries
Within leaves, the gasses enter and leave through specialized pores called...
  • stomata
  • stoma
  • holes
  • gaps
Alveoli are found in the...
  • gills
  • lungs
  • liver
  • brain
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