Homework Help is Here – Start Your Trial Now!
Science
Biology
A student placed populations of duckweed in two identical controlled-environment ponds. Only Lemna gibba was placed in pond A. Equal amounts of Lemna albba and Spiradela polyrhiza were placed in pond B. each pond was provided with suitable nutrients for duckweed growth. Every week a square metre sample of plants growing on the surface of each pond was removed and the weight of Lemna gibba plants in each sample was measured. The samples were then returned to the ponds. The following table shows the change in weight of Lemna gibba in pond A and in pond B over the eight weeks of the investigation. Time since experiment began (weeks) 0 1 2 3 4 ii. 5 6 7 8 Pond A Weight of Lemna gibba when grown alone (g) 60 110 190 255 285 335 330 340 360 Pond B Weight Lemna gibba when grown with Spiradela polyrhiza (g) 60 85 105 85 90 80 75 40 35 a) State one hypothesis that this investigation may have been designed to test. b) State the dependent variable in this investigation. c) Both ponds contained equal amounts of Lemna gibba at the start if this investigation. State two quantities that should have been deliberately kept the same for pond A and B. d) Describe the changes in the weight of Lemna gibba population in pond B over the eight weeks of the investigation. e) State one conclusion that can be reached by comparing the data for pond A and pond B. f) The student did not repeat this investigation. i. State why the validity of the results is reduced because the student did not repeat this investigation. The lack of repetition is a weakness in the design of this investigation. State one other weakness in the design of this investigation.

A student placed populations of duckweed in two identical controlled-environment ponds. Only Lemna gibba was placed in pond A. Equal amounts of Lemna albba and Spiradela polyrhiza were placed in pond B. each pond was provided with suitable nutrients for duckweed growth. Every week a square metre sample of plants growing on the surface of each pond was removed and the weight of Lemna gibba plants in each sample was measured. The samples were then returned to the ponds. The following table shows the change in weight of Lemna gibba in pond A and in pond B over the eight weeks of the investigation. Time since experiment began (weeks) 0 1 2 3 4 ii. 5 6 7 8 Pond A Weight of Lemna gibba when grown alone (g) 60 110 190 255 285 335 330 340 360 Pond B Weight Lemna gibba when grown with Spiradela polyrhiza (g) 60 85 105 85 90 80 75 40 35 a) State one hypothesis that this investigation may have been designed to test. b) State the dependent variable in this investigation. c) Both ponds contained equal amounts of Lemna gibba at the start if this investigation. State two quantities that should have been deliberately kept the same for pond A and B. d) Describe the changes in the weight of Lemna gibba population in pond B over the eight weeks of the investigation. e) State one conclusion that can be reached by comparing the data for pond A and pond B. f) The student did not repeat this investigation. i. State why the validity of the results is reduced because the student did not repeat this investigation. The lack of repetition is a weakness in the design of this investigation. State one other weakness in the design of this investigation.

Human Anatomy & Physiology (11th Edition)
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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
See similar textbooks
icon
Related questions
Question
D,e,f
Mailings Review View Tell me E EFET V V a V Time since experiment began (weeks) ii. 15 V A student placed populations of duckweed in two identical controlled-environment ponds. Only Lemna gibba was placed in pond A. Equal amounts of Lemna gibba and Spiradela polyrhiza were placed in pond B. each pond was provided with suitable nutrients for duckweed growth. Lccessibility: Investigate Every week a square metre sample of plants growing on the surface of each pond was removed and the weight of Lemna gibba plants in each sample was measured. The samples were then returned to the ponds. 0 1 2 3 4 5 6 V The following table shows the change in weight of Lemna gibba in pond A and in pond B over the eight weeks of the investigation. 7 8 AaBb CcDdI Heading 31 AaBbCcDdEe Normal Pond A Weight of Lemna gibba when grown alone (g) 60 110 190 AaBbCcDdEe AaBbCcDdEe No Spacing SO Table Text 255 285 335 330 340 360 a) State one hypothesis that this investigation may have been designed to test. b) State the dependent variable in this investigation. c) Both ponds contained equal amounts of Lemna gibba at the start if this investigation. State two quantities that should have been deliberately kept the same for pond A and B. d) Describe the changes in the weight of Lemng gibba population in pond B over the eight weeks of the investigation. e) State one conclusion that can be reached by comparing the data for pond A and pond B. f) The student did not repeat this investigation. i. Pond B Weight Lemna gibba, when grown with Spirodela polyrhiza (g) 60 85 105 85 90 80 75 40 35 State why the validity of the results is reduced because the student did not repeat this investigation. The lack of repetition is a weakness in the design of this investigation. State one other weakness in the design of this investigation. Focus Aa H
Transcribed Image Text:Mailings Review View Tell me E EFET V V a V Time since experiment began (weeks) ii. 15 V A student placed populations of duckweed in two identical controlled-environment ponds. Only Lemna gibba was placed in pond A. Equal amounts of Lemna gibba and Spiradela polyrhiza were placed in pond B. each pond was provided with suitable nutrients for duckweed growth. Lccessibility: Investigate Every week a square metre sample of plants growing on the surface of each pond was removed and the weight of Lemna gibba plants in each sample was measured. The samples were then returned to the ponds. 0 1 2 3 4 5 6 V The following table shows the change in weight of Lemna gibba in pond A and in pond B over the eight weeks of the investigation. 7 8 AaBb CcDdI Heading 31 AaBbCcDdEe Normal Pond A Weight of Lemna gibba when grown alone (g) 60 110 190 AaBbCcDdEe AaBbCcDdEe No Spacing SO Table Text 255 285 335 330 340 360 a) State one hypothesis that this investigation may have been designed to test. b) State the dependent variable in this investigation. c) Both ponds contained equal amounts of Lemna gibba at the start if this investigation. State two quantities that should have been deliberately kept the same for pond A and B. d) Describe the changes in the weight of Lemng gibba population in pond B over the eight weeks of the investigation. e) State one conclusion that can be reached by comparing the data for pond A and pond B. f) The student did not repeat this investigation. i. Pond B Weight Lemna gibba, when grown with Spirodela polyrhiza (g) 60 85 105 85 90 80 75 40 35 State why the validity of the results is reduced because the student did not repeat this investigation. The lack of repetition is a weakness in the design of this investigation. State one other weakness in the design of this investigation. Focus Aa H
Expert Solution
steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Photosynthesis & Respiration
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:
9780134580999
Author:
Elaine N. Marieb, Katja N. Hoehn
Publisher:
PEARSON
Biology 2e
Biology 2e
Biology
ISBN:
9781947172517
Author:
Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:
OpenStax
Anatomy & Physiology
Anatomy & Physiology
Biology
ISBN:
9781259398629
Author:
McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:
Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:
9780815344322
Author:
Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:
W. W. Norton & Company
Laboratory Manual For Human Anatomy & Physiology
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:
9781260159363
Author:
Martin, Terry R., Prentice-craver, Cynthia
Publisher:
McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)
Inquiry Into Life (16th Edition)
Biology
ISBN:
9781260231700
Author:
Sylvia S. Mader, Michael Windelspecht
Publisher:
McGraw Hill Education
SEE MORE TEXTBOOKS