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Snails + Water Weeds. Snails Ivory and blue mystery bulb snails Ivory and blue mystery bulb snails Apple Snails Apple Snails Family Ampullariidae Family.

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Presentation on theme: "Snails + Water Weeds. Snails Ivory and blue mystery bulb snails Ivory and blue mystery bulb snails Apple Snails Apple Snails Family Ampullariidae Family."— Presentation transcript:

1 Snails + Water Weeds

2 Snails Ivory and blue mystery bulb snails Ivory and blue mystery bulb snails Apple Snails Apple Snails Family Ampullariidae Family Ampullariidae Genus Pomacea Genus Pomacea These Ampullariidae have both a gill and a lung

3 Snails use photosynthesis or respiration?

4 Water Weeds - Wisteria Hygrophila difformis Hygrophila difformis Aquarium plant Aquarium plant Uses photosynthesis Uses photosynthesis

5 Lab Setup 8 airtight containers 8 airtight containers 4 under a light 4 under a light 4 in the dark 4 in the dark Bottle #Contents 1, 5Sprig of Hygrophila difformis 2, 6Snail 3, 7Sprig of Hygrophila difformis & Snail 4, 8Nothing – Control

6 Water + Bromothymol Blue

7 WDYT? What do you think? What do you think? What is going on in each container? What is going on in each container? Why are we putting 4 containers in the dark and 4 in the light? Why are we putting 4 containers in the dark and 4 in the light? Why bromothymol blue? Why bromothymol blue? What does this do? What does this do? Why should we have a control? Why should we have a control?

8 Initial Observation What color is the water? What color is the water? Will there be a change in what the liquid looks like after a couple of hours? Will there be a change in what the liquid looks like after a couple of hours? What gas exchange is occurring? What gas exchange is occurring?

9 Get into your groups Get into your groups Discuss your initial observations Discuss your initial observations Designate a speaker to talk about your group’s initial observations Designate a speaker to talk about your group’s initial observations

10 Info that may change your mind… Carbon dioxide dissolves in (and reacts with) water, forming carbonic acid, H 2 CO 3 Carbon dioxide dissolves in (and reacts with) water, forming carbonic acid, H 2 CO 3 CO 2(g) + H 2 O (l) ←→ H 2 CO 3 ←→ H + (aq) + HCO 3 – (aq) CO 2(g) + H 2 O (l) ←→ H 2 CO 3 ←→ H + (aq) + HCO 3 – (aq) The free hydrogen ions (H+) lower the pH of the solution, making it more acidic. The free hydrogen ions (H+) lower the pH of the solution, making it more acidic. As CO 2 dissolves in water, the pH of the solution will continue to decrease (becoming acidic). If CO 2 is removed from the solution, the pH will increase (becoming more basic) As CO 2 dissolves in water, the pH of the solution will continue to decrease (becoming acidic). If CO 2 is removed from the solution, the pH will increase (becoming more basic)

11 Bromothymol blue A pH indicator such as BTB can therefore indicate the relative amount of CO 2 dissolved in water based on the color of the solution. A pH indicator such as BTB can therefore indicate the relative amount of CO 2 dissolved in water based on the color of the solution. Higher pH: Blue, basic Higher pH: Blue, basic Lower pH: Yellow, acidic Lower pH: Yellow, acidic

12 Photosynthesis is Occurring

13 Cellular Respiration is Occurring C6H12O6 + 6H2O + 6O2→ 6CO2 + 12H2O + energy C6H12O6 + 6H2O + 6O2→ 6CO2 + 12H2O + energy Snail respires with or without light Snail respires with or without light Do plants have mitochondria? Can they respire? Look at Bottle 5. Do plants have mitochondria? Can they respire? Look at Bottle 5.

14 Do plants have mitochondria? Can they respire? Look at Bottle 5. Yellow  Indicating acidic solution Yellow  Indicating acidic solution CO 2(g) + H 2 O (l) ←→ H 2 CO 3 ←→ H + (aq) + HCO 3 – (aq) CO 2(g) + H 2 O (l) ←→ H 2 CO 3 ←→ H + (aq) + HCO 3 – (aq) Where did the CO2 come from? Where did the CO2 come from?

15 Where did the CO2 come from in Bottle 5? The CO2 was produced as a result of cellular respiration by the plant. The CO2 was produced as a result of cellular respiration by the plant. Both cellular respiration and photosynthesis occur in green plants when light is available. Both cellular respiration and photosynthesis occur in green plants when light is available. In Bottle 1, photosynthesis is the dominant process over respiration, resulting in a net decrease in CO2 In Bottle 1, photosynthesis is the dominant process over respiration, resulting in a net decrease in CO2 HOWEVER, in the absence of light, the plant cannot photosynthesize; it can only respire HOWEVER, in the absence of light, the plant cannot photosynthesize; it can only respire THEREFORE, there is a net increase in CO2 concentration and the pH drops as the CO2 dissolves, producing carbonic acid. THEREFORE, there is a net increase in CO2 concentration and the pH drops as the CO2 dissolves, producing carbonic acid.

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17 BottleConte nts PCRBottleConte nts PCR 1Plant5 2P & S6 3Snail7 4Contr ol 8

18 Revised Observation w/Lig ht Contents BTB color What happened? w/o light Contents BTB color What happened? 1Plant5 2P & S6 3Snail7 4Control8

19 WDYT - now Write a paragraph explaining what has occurred in the containers. Write a paragraph explaining what has occurred in the containers. Include information about the addition of hydrogen ions or the removal of CO 2 Include information about the addition of hydrogen ions or the removal of CO 2 What is an ecosystem? What is an ecosystem? What is sustainability What is sustainability


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