Back to quiz

6. What is absorbed by the blood from the small intestine?

  • electricity
  • Small soluble molecules of digested food
  • Small soluble elements
  • Large soluble molecules of indigested food
  • Only glucose

7. What are the tiny holes in the surface of a leaf called?

  • Guard Cells
  • Stomata
  • Stom
  • Leaves
  • Stomatra

8. Which gas diffuses out of leaves during darkness?

  • Ethane
  • Nitrogen
  • Carbon Dioxide
  • Oxygen
  • Methane

9. State one factor that will increase the rate of transpiration.

  • Damp air
  • Lower temperature
  • Higher temperature
  • Less wind

10. Which process releases the energy for active transport?

  • Transpiration
  • Breathing
  • Energy
  • Respiration
  • Photosynthesis

11. Why is it necessary for the small intestine to have a 'rich' blood supply?

  • So that the glucose can be taken away quickly and efficiently
  • So that the insoluble food can be taken away quickly and efficiently
  • So that the digested food can be taken away quickly and efficiently
  • So that the soluble food can be taken away quickly and efficiently

12. Why are the surfaces of the lungs thin?

  • There is more distance across which diffusion has to take place
  • to aid osmosis
  • To aid diffusion
  • There is less distance across which diffusion has to take place
  • There is less distance across which osmosis has to take place

13. What structures increase the surface area of the lungs?

  • Air spaces/Alvilli
  • Air sacs/Alveoli
  • Air places/Villi
  • Air sacks/Avelio

14. All exchange surfaces in humans have thin walls

  • False
  • True

15. what substances do roots take up?

  • Water, mineral ions and glucose
  • Glucose only
  • Water and mineral ions
  • Mineral ions only
  • Water only

16. Why are leaves very thin?

  • to help osmosis
  • Chlorophyll only likes thing leaves
  • Less distance inside the leaf to aid diffusion
  • To help sunlight work hard

17. Why do humid days result in less transpiration from leaves, even if it is hot?

  • Air already has a lot of water vapour - its more difficult to take from the plants
  • Water hates transpiration
  • Air already has a lot of water vapour
  • Air already has a lot of water vapour so doesn't work
  • Transpiration hates water

18. Why do cells need to take up some substances by 'active transport'?

  • Energy
  • Osmosis is banned
  • There is no oxygen
  • The substances are taken up against a concentration gradient
  • Diffusion is unhealthy