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Lesson
4: Dinner Time!
Purpose/Objectives:
- TSW investigate how
plants make their own food.
Materials
and Resources:
-
Elodea
plant
-
test
tube
-
beaker
-
water
Procedures:
Engage:
15 minutes
The students learned the process of photosynthesis so this lesson
is mainly a review of the process with the addition of a few more
concepts. The teacher will
pose a scenario for the students that they have to stand at one spot and
cook their own food for their entire lives. What would they eat and what is the process of making it?
At the end of five to ten minutes the teacher would ask for some
responses. Then the teacher
would lead the students into a discussion of how this is what all plants
go through and they have a process of making their food as well.
Explore:
20 minutes to 25 minutes
The teacher will put up a diagram of a plant leaf and lead the
class through a review of the process and clear up any misconceptions that
the students may have. The
teacher will also discuss what the products of photosynthesis are used
for.
Explain:
15 minutes
The teacher will prepare a demonstration that will show some of the
products of photosynthesis. The Elodea plant is inserted into a test
tube, which is then filled with water. The beaker is filled about
half way with water and the test tube with the Elodea and water is
inverted and stood up in the beaker. The test tube will capture any
gases that the Elodea plant releases. (i.e. oxygen from
photosynthesis) The teacher will tell the students that this is an
experiment that he/she has setup. Then the teacher will ask the
student to tell him/her what he/she is testing for. The teacher
should guide the students thinking through strategic questioning.
Along the way, the teacher should probe the students thinking for
explanations of what is going on in photosynthesis and correct any
misconceptions.
Elaborate/Evaluation
1:
The teacher will prepare a word search on the board with words used during
the lesson about the process of photosynthesis. Then the students
will be given a chance to find as many words as they can. Once
everyone has finished, the teacher asks for words that were found.
As students identify words, the teacher circles the word and then asks the
student to explain the importance of this word to photosynthesis.
Evaluate
2:
5 minutes to 10 minutes
The students will be asked to write a letter to their parents that
tells the process of how a plant makes its own food.
Student
Handouts/Activity Sheets:
Relevant
Safety Issues:
Assessment:
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Goals
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Evidence
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Points
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TSW
understand the steps in photosynthesis.
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TSW
write a letter explaining the process of photosynthesis and what
they learned about chlorophyll and chromatography.
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20%
for each stage
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TSWBAT
identify the structures involved in photosynthesis.
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20%
for the structure(s)
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