4. In an experiment to determine the water potential of fresh beetroot tissue, a student cut 12 rectangular 'chips' of tissue approximately 2 mm thick, 5 mm wide and 50 mm long, taken from the middle of a large beetroot. Two chips were immersed in each of six covered Petri dishes, one containing water and the others containing solutions of sucrose of different molarity, up to a maximum of 1 mol dm-3. The lengths of the chips were then measured accurately against graph paper seen through the bottoms of the dishes. Mean percentage changes in length of the chips were then measured after six hours. a. Why was it important to use fresh beetroot tissue in this experiment? b. Why would it have been important to immerse the beetroot chips as soon as possible after they were cut?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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4. In an experiment to determine the water potential of fresh beetroot tissue, a student cut
12 rectangular 'chips' of tissue approximately 2 mm thick, 5 mm wide and 50 mm long, taken
from the middle of a large beetroot. Two chips were immersed in each of six covered Petri
dishes, one containing water and the others containing solutions of sucrose of different
molarity, up to a maximum of 1 mol dm-3. The lengths of the chips were then measured
accurately against graph paper seen through the bottoms of the dishes. Mean percentage
changes in length of the chips were then measured after six hours.
a. Why was it important to use fresh beetroot tissue in this experiment?
b. Why would it have been important to immerse the beetroot chips as soon as possible
after they were cut?
C. Suggest why length was measured rather than volume.
d. Why were at least two chips added to each dish?
e. Why were the dishes covered when left?
f. Suggest one advantage of measuring change in length rather than change in mass of the
chips in this experiment.
Transcribed Image Text:4. In an experiment to determine the water potential of fresh beetroot tissue, a student cut 12 rectangular 'chips' of tissue approximately 2 mm thick, 5 mm wide and 50 mm long, taken from the middle of a large beetroot. Two chips were immersed in each of six covered Petri dishes, one containing water and the others containing solutions of sucrose of different molarity, up to a maximum of 1 mol dm-3. The lengths of the chips were then measured accurately against graph paper seen through the bottoms of the dishes. Mean percentage changes in length of the chips were then measured after six hours. a. Why was it important to use fresh beetroot tissue in this experiment? b. Why would it have been important to immerse the beetroot chips as soon as possible after they were cut? C. Suggest why length was measured rather than volume. d. Why were at least two chips added to each dish? e. Why were the dishes covered when left? f. Suggest one advantage of measuring change in length rather than change in mass of the chips in this experiment.
9. Suggest
advantage of measuring change in mass rather than change in length.
one
Transcribed Image Text:9. Suggest advantage of measuring change in mass rather than change in length. one
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