Bean Seeds to Plants
B2, Level 2
Students use appropriate instruments to conduct simple experiments
to answer a specific question about the natural or designed world.
Key Concepts and
Students improve experimental design techniques.
About two months.
Students will investigate the effects of changing variables such
as water, light, and fertilizer on the growth of a bean plant.
Students will also closely observe bean seeds and plants in various
stages of growth.
- Bean seeds
- Black plastic
- Soileasuring cups
- Dissecting equipment
- Tiny Seed, by Eric Carle
- Hand lenses
- Science journals
- Zip-close bags
- Variety of fast-growing Alaskan seeds
- Grow light
- Paper towels
- Chart paper
Read Tiny Seed by Eric Carle. Show students a variety of seeds.
Ask students to describe the seeds. Ask students what they know
about plant growth. Ask students what questions they have about
how plants grow. List questions on chart paper and display in
Soak different bean seeds in water overnight. Dissect seeds
and observe with hand lenses. Record observations. Ask students
what new questions they have about the seeds and how they grow.
List questions on another sheet of paper. Work with students to
organize their questions into the following categories:
- Questions we can investigate
- Questions we can research with our own sources
- Questions we need to ask an expert
As a class, choose one question to investigate. Work as a class
to write a testable question that is appropriate for the level
of students, materials available, etc. Discuss variables, how
to control variables and how to manipulate a single variable.
Brainstorm types of observations and measurements to make. Discuss
ways to record data.
Pass out more seeds, bags, and wet paper towels and have students
place seeds in bags with wet paper towel. Hang the bags in front
of a window or under a grow light. Have students observe, measure,
and record data every other day as seeds sprout. They should include
measurement, sketches, and observations in their journals,
- Teach students the elements of a technical report and have
them write up their results and conclusions.
- Have a pot-luck with different bean and vegetable dishes.
- Have students research about the University of Alaskas
experimental farm activities to produce northern-adapted seeds.
- Research where the beans or Alaskan seeds they have grown
Students observe bean seeds and bean plants in various stages
of growth and investigate the effects of changing variables (e.g.,
water, light, fertilizer) on the growth of a bean plant.
- Review the questions about plant growth listed at the beginning
of the lesson and add additional questions of interest to students.
- Partner with someone who would like to ask the same question.
(If a student has a question that no one else has, he or she
may work alone.)
- Design their own experiment using the same kind of seeds.
- Set up a control plant, or plants, to which no changes are
- Write or select a testable question.
- Predict what they think results will be.
- Design an investigation to test their prediction.
- Collect data daily. Measure and document, in words and pictures,
what happens to the seed and plant. Label the plant parts at
- Repeat the experiment three times.
- Analyze data and write/illustrate results and conclusions.
- Students share with the class their experimental design,
results, and conclusions; including problems they had with the
investigation, and how they solved them.
Discuss what they would do differently next time and why. Discuss
how each group ensured that each test was fair (control variables,
Level of Performance
|| Student work is complete, correct, and shows evidence
of elaboration, extension, and mastery of drawing inferences based
on experimental data. The investigation has a testable question, makes
a prediction, lists variables, controls the variables when possible,
manipulates a single variable, makes accurate measurements, records
results, and makes appropriate conclusions.
|| Student work is complete but shows limited evidence
of elaboration, extension and ability to draw inferences based on
experimental data. The investigation includes a testable question,
makes a prediction, lists some variables, controls most (but not all)
variables, manipulates a single variable, makes measurements that
are mostly accurate, and records results but makes inappropriate conclusions.
| Student work may be incomplete or incorrect and shows
limited evidence of understanding variables and how to manipulate
them. The investigation may ask a testable question and make a prediction.
However, the results are inaccurate or incomplete and the conclusion,
if present, does not relate to or reflect the experimental data.
Student work is incomplete and incorrect. Although the investigation
may consider questions about plant growth, it lacks an experimental
procedure that reflects variables, controls, data collection or
Department of Education & Early Development Standards)
Plan and conduct a simple investigation. As students develop,
they may design and conduct simple experiments to answer questions.
The idea of a fair test is possible for many students to consider
by fourth grade. (Page 122)
Scientists use different kinds of investigations depending on
the questions they are trying to answer. Types of investigations
include describing objects, events, and organisms; classifying
them; and doing a fair test (experimenting). (Page 123)
Different kinds of questions suggest different kinds of scientific
investigations. Some investigations involve observing and describing
objects, organisms, or events; some involve collecting specimens;
some involve experiments; some involve seeking more information;
some involve discovery of new objects and phenomena; and some
involve making models. (Page 148)
Scientific investigations sometimes result in new ideas and
phenomena for study, generate new methods or procedures for an
investigation, or develop new technologies to improve the collection
of data. All of these results can lead to new investigations.
Results of similar scientific investigations seldom turn out
exactly the same. Sometimes this is because of unexpected differences
in the things being investigated, sometimes because of unrealized
differences in the methods used or in the circumstances in which
the investigation is carried out, and sometimes just because of
uncertainties in observations. It is not always easy to tell which.
Scientific investigations may take many different forms, including
observing what things are like or what is happening somewhere,
collecting specimens for analysis, and doing experiments. Investigations
can focus on physical, biological, or social questions. (Page
Seek better reasons for believing something than Everybody
knows that . . . or I just know
and discount such reasons when given by others. (Page 299)
Alaska Science Content
Standard Key Element
student who meets the content standard should design and conduct scientific
investigations using appropriate instruments.
Content and Performance Standards: A15, A12, A14, B1