2. A learner carried out an experiment on water loss from leaves. The learner wanted to find out which surface of a leave loses more water. He set up the following experiment. Leaf 1 has no vaseline,leaf2 vaseline covering lower surface,leaf3 vaseline covering upper surface. The learner weighed each leaf at the start and hung them on the line. He weighed them again after 24 hours. When water is lost from a leaf the mass of the leaf decreases. The table shows the percentage decrease in mass of the three leaves after 24 hours. 2.1Use the equation to calculate the percentage decrease in mass of leaf Show all your working. 2.2 The percentage decrease in mass is used to compare the results. Explain why. 2.3 The learner did not put vaseline on either surface of leaf 1. What was the purpose of of leaf 1? 2.4 The learner covered the lower surface of leaf 2 with vaseline. Suggest why leaf 2 had the smallest percentage decreae in mass.
2. A learner carried out an experiment on water loss from leaves. The learner wanted to find out which surface of a leave loses more water. He set up the following experiment. Leaf 1 has no vaseline,leaf2 vaseline covering lower surface,leaf3 vaseline covering upper surface. The learner weighed each leaf at the start and hung them on the line. He weighed them again after 24 hours. When water is lost from a leaf the mass of the leaf decreases. The table shows the percentage decrease in mass of the three leaves after 24 hours. 2.1Use the equation to calculate the percentage decrease in mass of leaf Show all your working. 2.2 The percentage decrease in mass is used to compare the results. Explain why. 2.3 The learner did not put vaseline on either surface of leaf 1. What was the purpose of of leaf 1? 2.4 The learner covered the lower surface of leaf 2 with vaseline. Suggest why leaf 2 had the smallest percentage decreae in mass.
Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter31: Soil And Plant Nutrition
Section: Chapter Questions
Problem 4RQ: For an element to be regarded as essential, all of the following criteria must be met, except: No...
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2. A learner carried out an experiment on water loss from leaves. The learner wanted to find out which surface of a leave loses more water. He set up the following experiment.
Leaf 1 has no vaseline,leaf2 vaseline covering lower surface,leaf3 vaseline covering upper surface.
The learner weighed each leaf at the start and hung them on the line. He weighed them again after 24 hours. When water is lost from a leaf the mass of the leaf decreases. The table shows the percentage decrease in mass of the three leaves after 24 hours.
2.1Use the equation to calculate the percentage decrease in mass of leaf Show all your working.
2.2 The percentage decrease in mass is used to compare the results. Explain why.
2.3 The learner did not put vaseline on either surface of leaf 1. What was the purpose of of leaf 1?
2.4 The learner covered the lower surface of leaf 2 with vaseline. Suggest why leaf 2 had the smallest percentage decreae in mass.
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