|Projects and Laboratory Exercises
This is a collection of ideas and links to sites with
Some of the links provide complete packages of materials, including
data sheets and report formats. Others are more sketches of
or suggestions. Many of them involve counting
fronds to measure population growth, but many other biological or
parameters can easily be investigated using these plants. Two
are plant dormancy and
and function of roots.
from a wetland.
- See inside the
A simple method of clearing and staining duckweeds will allow students
to visualize the hidden structures of the frond using a magnifier or
[ sample photo ]
and dabbling in duckweed. by Stephen Tomkins. In Osmosis,
the SAPS Newsletter, Homerton College, Cambridge, UK.
with duckweed by Stephen Tomkins. In Osmosis, the
Newsletter, Homerton College, Cambridge, UK.
Student Sheet 21 - Measuring Duckweed (Lemna minor) with student and teacher notes.
Delpech, Haberdasher's Askes' School
method and biological concepts demonstrated using duckweed.
by G. Robinson (1988) School Science Review, 69(248), 505-508
for Science Education, College Lane, Hatfield, Herts AL10 9AA UK.
Download PDF File (143KB)
peroxidase activity in plant tissues. Roger
Haberdasher's Askes' School. This article provides a rapid
for extracting and making quantitative measurements of peroxidase
activity. Duckweed tissues are suitable for this study.
Inquiry (EI), is a website and curriculum series developed at
Cornell University to help students conduct authentic environmental
science research and participate in communities of fellow student
scientists. In 2003, EI won an Environmental
Quality Award from EPA for Excellence in Environmental
Education. EI is dedicated to the creation, evaluation,
distribution of inquiry-based environmental science materials. EI
includes several topic areas, including environmental toxicology --
bioassays to assess environmental health and making judgments about
levels of risk Each module includes activities to engage
students in three progressive levels of inquiry, modeled after research
activities that scientists normally conduct. One of the labs is a
- Exercises from a book published by the National Academy
Reference: The Committee on Biology
Role of Scientists in the Professional Development of Science Teachers.
National Academy Press, Hardcover - 175 pages (pub. May 1996). Available
from Amazon.com: [ More
information on this book ]
Does Fertilizer Affect Aqueous Plants?" from the KDE
(Kids Do Ecology) project, National Center for Ecological Analysis and
Synthesis, Santa Barbara, CA. "Students will explore the pros and
of fertilizer, and draw conclusions regarding the effects of increased
vegetation in aquatic systems. [ no longer on-line]
A student write-up from this project, "How
Pollution Affects Duckweed" by Mrs. Rogers-O'Reilly's 5th Grade
Adams Elementary School, Santa Barbara, CA, Spring 1998. "We
an experiment to find out how pollution affects duckweed. We tested
types of pollution: vinegar to mimic acid rain, lots of
to mimic a common urban pollution and we also used golf course
from a golf course near our school to find out what it did to the local
water, plants, and duckweed."
- A Science Fair Project, Does
Lemna Minor Lower the Nitrate Level of Water? by Liza
Divine Savior Holy Angels High School, Milwaukee, Wisconsin. This
project won a scholarship award in the 45th Annual Southeastern
Science and Engineering Fair, March 27, 1999. [ no longer
of an actual Lemna growth experiment by John W. Cross.
that there are no treatments shown in this experiment.
cultures were replicated controls for treatments that are not presented
here. The purpose is to illustrate the variability of the
data and how such growth data can be analyzed.
- Books on duckweeds and
other aquatic plants.
contact me if you know of other
learning experiments for schools or colleges. If you have done a
project and would like to put it on these pages as an example,
be very interested. I can help you format it and you will get
credit for authorship. Projects with data tables, drawings or
are particularly desirable.
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Last revised: December 17, 2011