Snail Elodea Lab General Biology Laboratory Notes Introduction

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Snail & Elodea Lab General Biology Laboratory Notes

Snail & Elodea Lab General Biology Laboratory Notes

Introduction Plant = Producer – Can utilize light to make food as it grows.

Introduction Plant = Producer – Can utilize light to make food as it grows. Snail = Consumer – Cannot manufacture its own food. – Must consume organic compounds produced by plants and/or other animals.

Photosynthesis Carbon Dioxide + Water + Sun’s Energy → Food + Energy

Photosynthesis Carbon Dioxide + Water + Sun’s Energy → Food + Energy

Respiration Occurs in plants and animals. Plants respire as they grow, circulate nutrients, and

Respiration Occurs in plants and animals. Plants respire as they grow, circulate nutrients, and utilize energy.

Indicator A substance that shows the presence of a chemical substance by changing color.

Indicator A substance that shows the presence of a chemical substance by changing color. Bromthymol Blue, (BTB): Indicator that changes to a green or yellow color in the presence of an acid.

Demonstration Blow into a straw that is immersed in water and BTB. 1) Do

Demonstration Blow into a straw that is immersed in water and BTB. 1) Do you see a color change? 2) If so, why?

Why did the water change color? Carbon dioxide (CO 2) forms an acid when

Why did the water change color? Carbon dioxide (CO 2) forms an acid when dissolved in water: – H 20 + CO 2 ↔ H 2 CO 3 (Carbonic Acid) In this experiment, bromthymol blue can be used to indicate, indirectly, the presence of CO 2 and the dominance of respiration. Lab Set-Up.

Lab Observations Take down observations of each tube for the starting day on your

Lab Observations Take down observations of each tube for the starting day on your observation sheet. Then, on a sheet of paper titled “Snail & Elodea Lab, ” write your hypothesis about what will happen to each tube during this experiment. Tubes: A 1, A 2, A 3, A 4: Light 1 st Night Tubes: B 1, B 2, B 3, B 4: Dark 1 st Night