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Gaseous Exchange in Animals

Gaseous Exchange in Animals. peanut. Does the food really burn in our body?. Food has to be burnt to release energy. What is respiration?. A. B. food. RESPIRATION. C. oxygen. BODY CELL. ENERGY. carbon dioxide. food. +. +. oxygen. +. water.

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Gaseous Exchange in Animals

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  1. Gaseous Exchange in Animals

  2. peanut Does the food really burn in our body? Food has to be burnt to release energy.

  3. What is respiration?

  4. A B food RESPIRATION C oxygen BODY CELL

  5. ENERGY carbon dioxide food + + oxygen + water We can summarise the process of respiration in a simple word equation. Where does the oxygen required for respiration is obtained? How is it transported to the body cells?

  6. XPERIMENT 7.18 (p.56) Materials and apparatus boiling tubes test tube rack thread hydrogencarbonate indicator aluminium foil stoppers table lamp green leaves 4 1 2 about 20 cm3 2 4 1 about 50 cm Gaseous exchange in plants

  7. aluminium foil leaves A B C D hydrogencarbonate indicator 1. Set up the apparatus as shown in the diagram on the right.

  8. 2. Leave the boiling tubes in bright light for about one hour. Then record the colour of the indicator. Which tubes are used as the control? _______

  9. Gas A Gas B This exchange of oxygen and carbon dioxide is called gaseous exchange. Do you know? Experiment 7.15

  10. Experiment 7.15 • Step 1 : Tube B is a control experiment. Why? • http://aero.spss.edu.hk/~ilau/I.S./chapter%207/

  11. Gaseous exchange in animals • Animals obtain energy in a process called _______________. • Animals take in _________ and give out _______ during breathing.

  12. Gaseous exchange in plants

  13. Activity 7 (e) Feeling dizzy in a plant house Eric likes plants very much. His house is fully decorated with green plants. I like green plants very much. They make me healthy by providing me with a large amount of oxygen.

  14. One night, Eric slept in his house with all the windows closed. He felt dizzy in the next morning. What is the possible reason that makes Eric feel dizzy? Discuss with your classmates to find it out.

  15. XPERIMENT 7.18 Materials and apparatus boiling tubes test tube rack thread hydrogencarbonate indicator aluminium foil stoppers table lamp green leaves 4 1 2 about 20 cm3 2 4 1 about 50 cm Gaseous exchange in plants

  16. aluminium foil leaves A B C D hydrogencarbonate indicator 1. Set up the apparatus as shown in the diagram on the right.

  17. 2. Leave the boiling tubes in bright light for about one hour. Then record the colour of the indicator. Which tubes are used as the control? _______

  18. The table below shows the colours of hydrogencarbonate indicator in the presence of different concentrations of carbon dioxide.

  19. Expt. 7.18-video • http://aero.spss.edu.hk/~ilau/I.S./chapter%207/

  20. Explain the results in tube A. The leaf in tube A carries out both photosynthesis and respiration. The rate of _____________ is higher than that of __________. As _____________ needs carbon dioxide, the concentration of carbon dioxide in tube A is __________. The indicator turns __________.

  21. Explain the results in tube B. As light is blocked by the aluminium foil, the leaf in tube B does not carry out ____________. It only carries out ____________, ____________ is given out and its concentration ___________ (increases / decreases). Then, the indicator turns _________.

  22. Green plants can carry out photosynthesis : take in carbon dioxide and produce oxygen. Do green plants really release oxygen ALL the time ? Activity 7(e) Experiment 7.18

  23. photosynthesis In day time, green plants carry out photosynthesis. carbon dioxide carbon dioxide carbon dioxide oxygen oxygen oxygen

  24. respiration Remember that green plants respire BOTH day and night. oxygen oxygen carbon dioxide carbon dioxide

  25. respiration At night, photosynthesis stops(why?) and only respiration occurs. oxygen oxygen oxygen carbon dioxide carbon dioxide carbon dioxide Gaseous exchange in green plants in the day time is ________from that at night.

  26. http://www.bbc.co.uk/schools/gcsebitesize/biology/greenplantsasorganisms/0photosynthesisrev6.shtmlhttp://www.bbc.co.uk/schools/gcsebitesize/biology/greenplantsasorganisms/0photosynthesisrev6.shtml

  27. oxygen carbon dioxide in air carbon dioxide oxygen oxygen respiration photosynthesis > respiration carbon dioxide Under bright sunlight At night Net uptake: Gas A Net release: Gas B Net uptake: Gas A Net release: Gas B Rate of photosynthesis

  28. What have you learnt in this lesson? • Under bright sunlight, there is a net uptake of _______and a net release of _________ by green plants. • At night, green plants only release _______ and take in _________.

  29. Homework w/b 2A • P.11(part A 1, 2,4,5) • P.13(1) • P.15(B) • P.17(1-5, 7) • P.18-19(1-5) • P.20(7) • P.21-23(1,3,4) • P.24(6)

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