UNSCRAMBLE THE MYSTERY: FROM EGG TO CHICKEN
In this lesson and its extension opportunities, the students
should have the opportunity to learn about the parts of an egg and its function
in the development of the chicken. Students will perform various experiments
in which they will note patterns and change in an egg due to the porosity
and permeability of an egg. Additionally, students will perform an experiment
in which they will observe the strength of an egg's shell.
Take A Look #5: Eggs
Students will be able to:
- identify the parts of an egg
- label a diagram of an egg
- state the basic function for each part of an egg
- observe the movement of liquid through pores of an eggshell
- analyze and compare the affect of vinegar, water, and corn syrup on
- and estimate and compare the amount of air released from the air cell
(air sack) of various eggs
Per group of 4 - 6 students:
Per group of 4 - 6 students:
Eggshell Porosity Activity:
- When Will I Hatch Activity calendar of month(s) determined by the
- 1 hard-boiled egg
- 1 hand lens
- 1 toothpick
- blue food coloring
- graph paper
Membrane Permeability, Activity One:
Membrane Permeability, Activity Two:
- 1 cup of water
- blue food coloring
- 1 rubbery egg (made by soaking an egg in vinegar for 24 - 48 hours)
Filled With Air Activity: To one group, distribute a small egg, to the next
group a medium egg, to another a large egg, and to the last group an extra
large egg which has a pre-drilled hole completed by the teacher.
- 2 rubbery eggs of comparable size and weight
- 1 tape measure
- 1 balance and weights
- 1 cup of corn syrup
- 1 cup of water graph paper
The Strength of Shells Activity:
- 1 cup of water (per group)
- stop watch
- graph paper
- 1 sheet of plastic wrap
- 1 newspaper
- 3 eggs
- 1 balance and weights
- several books of the same size and weight
- graph paper
The following words will be introduced during the viewing segment:
germinal spot - the part of an egg from which a chicken will develop albumen
- the white of an egg which acts as a cushion for the yolk - the round
yellow mass which provides nutrients for the developing embryo air sack
(cell) - the air space usually found at the large end of the egg shell membrane
- two thin membranes next to the shell and surrounding the albumen and yolk;
known as the inner and outer shell membranes; they are one of the egg's
chief defenses against bacterial invasion shell - the hard outer surface
of the egg made up largely of calcium carbonate; the shell has pores which
allow the egg to lose carbon dioxide and moisture chalazae - the two whitish
cords on opposite sides of the yolk which hold the yolk in the center of
the albumen and serve as rotating axis to keep the germ cell on the top
side of the yolk and next to the hen's body fertile - an egg that is fertilized;
the capability of an egg to develop into a chick infertile - an egg that
is not fertilized; will not hatch
Distribute a hand lens and a container with one cracked, raw egg per group.
Students are to examine the egg and predict the function of each part.
The teacher will list the observations and predictions generated by the
students on the board. Use the vocabulary presented by the students and
adjust predictions as needed during the viewing segments.
The focus for viewing is a specific responsibility or task(s)
students are responsible for during or after watching the video to focus
and engage student viewing attention. Students will watch this video to
learn how to correctly identify and label the parts of an egg. Prior to
labeling a diagram of the egg, students will be asked to compare their predictions
(listed on the board) with the actual name and function of each part of
the egg. After each pause, the teacher should refer the students to their
predictions and modify them as necessary. Additionally, students should
use their raw egg to locate the parts as they are mentioned in the video
segments. The initial segment explains the difference between a fertile
and an infertile egg.
BEGIN the video Take a Look #5: Eggs as Kate and
her friend are leaving the barn. The audio cue is " The hens sure are
laying a lot of eggs. Why aren't there any chicks? Don't chicks come from
PAUSE just prior to Kate's cracking the egg. The audio cue is "Here
I'll show you!" Students will view the next segment to learn which
part of the egg will develop into the chick. After Kate identifies the germinal
spot, have students locate this spot on their raw egg.
Note to the teacher: If the germinal spot cannot be located, it may be necessary
to turn over the yolk.
RESUME and PAUSE after the question "What's the yolk
for?" Refer student attention to their prediction listed on the board.
Watch this segment to verify or alter the information predicted for the
function of the yolk.
RESUME and PAUSE after Kate explains "It's full of nutrients.
That's why we eat it." Have students locate the white string-like objects
found on the raw egg. Students are to listen to the next segment to determine
Note to the teacher: The video segment does not name these cords. They are
called the chalazae. If desired, the teacher will need to introduce this
term. RESUME and PAUSE after the audio cue "The yolk
is also protected by the white part."
Students are to view the next segment to learn the function and the correct
vocabulary term for the white portion of the egg. RESUME and PAUSE
after the question "And what other thing helps protect the young chick?"
Have students predict the answer to this question, then watch the next segment
RESUME and PAUSE after Kate explains that the chick uses the
calcium in the shell for its bones. In the next video segment, Kate will
poke a hole in the shell to demonstrate the release of air from the air
cell of the egg. Students should make special note of which end of the egg
contains the air cell. They will use this information in one of the post-viewing
Note to the teacher: Prior to resuming the video, distribute the diagram
of the egg. Students will use the information in the video to correctly
label this diagram. The first item to be identified is the germinal spot.
Have students locate this item on their diagram. Additionally, they should
recall its function. Students should listen to confirm this information.
RESUME and PAUSE after the question "And the yolk?"
Students should correctly label and define the germinal spot. Students should
locate the yolk, then listen to the next video segment for verification.
RESUME and PAUSE after the statement" . . . then there's
the albumen." Have students label and define the yolk. Students should
locate the albumen, then listen to the next video segment for verification.
RESUME and PAUSE after the statement " . . . then we
have the air sack." Students should label and define the albumen. Students
should locate the air sack, then listen to the next video segment for verification.
Note to the teacher: Students will need to locate and label any additional
parts, such as the chalazae, which was discussed earlier, but not presented
during the interactive labeling section.
RESUME and PAUSE after the question mark is displayed. During
the remaining portion of the video, students will be asked to use their
diagrams to help them review the egg parts. The students will be asked to
come to the television and locate the albumen, yolk, and germinal spot.
Turn off the sound. Ask for a volunteer to locate the albumen. SLOW ADVANCE
the video as the student approaches the screen to locate the albumen.
PAUSE the video after the term "albumen" and the arrow
locating it are displayed on the scene. Ask another volunteer to define
Ask for another volunteer to locate the yolk. RESUME and PAUSE
after the term and arrow for the yolk are presented on the screen.
Ask for another volunteer to locate the germinal spot. RESUMEand
PAUSE after the term and arrow for the germinal spot are presented
on the screen.
Note to the teacher: The location of any additional parts must be determined
by the teacher.
FAST FORWARD and RESUME as the chick is seen hatching from
the egg. Students are to determine the number of days required for a chick
to develop and hatch. Students will be required to utilize this number during
a post-viewing activity; therefore, they should record this number for reference
(21 days). PAUSE after the chick has dried. During the next segment,
the strength of eggs is demonstrated. The students will recreate this activity
and, therefore, need to listen for the procedure. RESUME and PAUSE
after the verbal cue "Did you expect they'd hold so many?" Review
the procedure for this activity. Display a rubbery egg. The students should
listen for the procedure for making rubbery eggs. RESUME and STOP
the video after the verbal cue "The acid in the vinegar has taken the
calcium out of the egg, so it is soft and rubbery."
Students will use information presented in the viewing segments
in the following activities:
When Will I Hatch? This is a problem-solving activity which builds upon
their knowledge that a chick requires 21 days to develop and hatch. Provide
the students with a calendar (especially challenging would be one in which
holidays or vacation times must be considered). Have students calculate
the day in which incubation should begin. Remind the students that the hatching
date must occur during the school week otherwise this moment could not be
observed. Note to the teacher: In most cases, incubation should begin on
a Tuesday or a Wednesday.
Eggshell Porosity Remind the students that air and water will pass through
the air hole in the shell of the egg to the embryo. Distribute the hard-boiled
eggs and hand lenses. Have the students observe the eggshell to locate the
pores. To make the pores more visible, use the toothpick to place a small
dot of blue food coloring on the eggshell. Let the egg dry for at least
one hour, longer if possible. Toward the end of class time, observe the
egg and note any changes. Remove the shell and observe the blue area on
the cooked egg white. Explain that the food coloring went through the pores
in the eggshell, just like the air and water go through them to the embryo.
Membrane Permeability, Activity One To demonstrate membrane permeability,
place several drops of blue food coloring into a cup of water. The water
should be a dark blue color. Place a rubbery egg into the blue water. Although
these softened eggs can withstand a good amount of handling, caution the
students to handle them gently so as to prevent rupturing the egg. The movement
of the water into the egg will become apparent when the egg turns blue.
Membrane Permeability, Activity Two Select two comparable eggs. Using a
balance, carefully weigh and measure the diameter of two eggs. Place one
in a cup of water and the other in a cup of corn syrup. Keep the eggs in
each substance for at least 45 minutes. At fifteen-minute intervals, remove
and blot each egg, then carefully weigh and measure the eggs. Chart and
graph the findings. Compare the results.
Note to the teacher: Soaking the egg in the vinegar to remove the shell
leaves the semipermeable membrane. The permeability activities demonstrate
the process of osmosis. Osmosis is the flow of fluid through a semipermeable
membrane separating two solutions, which permits the passage of the solvent
but not the dissolved substance. A liquid will flow from a weaker to a stronger
solution, thereby equalizing the concentrations of solutions.
In these activities, the size of the egg will change due to the process
of osmosis. As a result of the water diffusing through the membrane into
the egg, an egg placed in the water will become larger and heavier. As the
water inside the egg moves from the egg into the corn syrup, the egg placed
in the corn syrup will become smaller and lighter.
Filled With Air Select a raw egg. The teacher should carefully drill a small
hole in the larger end of the egg (the location of the air sack), place
it in a cup of water, and time the interval it takes to release the air
inside the air sack. The students should utilize this information to estimate
the air release time interval of eggs of varying sizes. The teacher should
drill a hole in the eggs which will be utilized by the student groups. The
students should chart and graph their information. After completing this
activity, students should compare results to determine if there is a relationship
between the size of the egg and the time interval for the air that is released
from the air sack.
The Strength of Shells Students will recreate the activity presented in
the video. Distribute three raw eggs, newspaper, and a sheet of plastic
wrap per group of students. Have students predict the number of ounces the
eggs will be able to support before breakage occurs. Using books of equal
weight, carefully place books on top of the three eggs. Record and chart
the results. Select one group of students to record the results utilizing
small eggs, while other groups record the results using medium, large, and
extra-large eggs. Compare the results to determine if there is a relationship
between the size of the egg and the number of ounces it can support before
Write to an egg-producing company to learn how eggs are graded,
packed, and shipped to prevent breakage.
Invite a local egg producer to the classroom to discuss the care of chickens
and their production rates.
Write to the Agriculture Education Field Advisor for information about local
egg producers, egg production, and the different breeds of chickens. Write
to Tyson Farms to learn how long it takes to get the chicken from an egg
to a poultry meat item. Ask them to explain their environmental plan for
the safe disposal of refuse.
Write to local restaurants to determine and compare the number of eggs purchased
and used in a week.
Math and Science: Have students design a container to protect
an egg from breakage when dropped from a predetermined height.
Math: Have students record their daily egg consumption for a week. Then
chart the daily egg consumption rate of the class to determine the average
number eaten per day. The students could then compare their personal rate
to the class average.
Math: Research and chart the egg size and/or incubation period of different
Math: Calculate the cost per egg of the various egg sizes. Decide which
is the better buy.
Language Arts: Have students pretend they are a chick preparing to hatch.
Have them write about the hatching experience.
Language Arts: Have students submit their favorite egg recipe and construct
a class egg recipe book.
Language Arts and Science: Have students write and illustrate a book about
the chicken life cycle.
Social Studies: Have students view Reading Rainbow #809: Rechenka's Eggs
to learn about a traditional Russian method of decorating eggs.
Art: Use crayons and black tempera paint to create crayon resistant egg
designs like those seen in Rechenkas's Eggs.
Art: Construct papermaché egg boxes.
Art: Use egg cartons to construct imaginary creatures.
Science: Have students view Reading Rainbow #408: Chickens Aren't the Only
Ones to learn about other animals that lay eggs.
Science: Incubate some chicken eggs. A good source of materials and additional
information on how to incubate eggs can be found in "Agriscience Kit:
#AK-01 Eggciting Experiments - Chick Incubation and Embryology." For
more information, write to: Vocational Agriculture Service, University of
Illinois, 1401 S. Maryland Drive, Urbana, Illinois 61801 or call (217) 333-3871.
Click here to view the
worksheet associated with this lesson.
Master Teachers: Valerie Lyle and Kathleen Shannon
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