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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
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