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Loss in Mass Through Transpiration.

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Introduction

Kimberly Wong 10F Loss in Mass Through Transpiration Aim: * To investigate the loss of water and mass in the leaf * To find out if more water is lost sat the top/bottom of the leaf Prediction: I predict that the leaf without any Vaseline on it would lose the most mass and water because there is nothing blocking the stomata, therefore water will evaporate, but no water will be taken in. The next one that will lose the most water will be the one with Vaseline on the top only. This is because there are more stomata on the bottom and therefore more water will be lost than if there was Vaseline only on the bottom, which has a lower number or stomata. ...read more.

Middle

2. Cover one leaf with Vaseline on both sides. Label it. 3. Cover one leaf with Vaseline on the top only. Label it. 4. Cover one leaf with Vaseline on the bottom only. Label it. 5. Tie the piece of string in between the two clamps. 6. Hang the four leaves up separately using the paperclips onto the string. 7. Leave the leaves there for a long period of time (e.g. one week). 8. Take the four leaves off of the string. Take off the paperclip, but make sure you still know which leaf is which. 9. Weigh each leaf again and record the mass. Results: Mass Before Vaseline (g) Mass After One Week With Vaseline (g) Change in Mass (g) ...read more.

Conclusion

This is because one side is blocked, preventing any water from evaporating. Also, it lost more mass than the leaf with Vaseline only on the bottom because there are more stomata on the bottom of the leaf and therefore more water could evaporate decreasing the mass. The next leaf that should have had the greatest change in mass should have been the leaf with Vaseline only on the bottom, and the leaf that should have had the smallest change in mass should have been the leaf with Vaseline on both sides instead of the leaf with Vaseline only on the bottom. This is because the stomata were blocked by the Vaseline, preventing water from evaporating. Order of Change in mass (greatest change to smallest change): 1. Leaf with no Vaseline 2. Leaf with Vaseline on the top only 3. Leaf with Vaseline on the bottom only 4. Leaf with Vaseline on both sides ...read more.

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