|Environmental Science||Populations and Ecosystems 6G1.00||Unifying Concepts of Science||Scale and Model 2.1 c|
CONTENT STANDARD: Environmental Science
CONTENT TOPIC: Populations and Ecosystems
CONCEPT: Photosynthesis and cellular respiration are life-sustaining plant processes.
CONTENT OBJECTIVE: 6G1.00 To understand how the process of photosynthesis changes sunlight into stored chemical energy by producers
INSTRUCTIONAL OBJECTIVES: The learner will:
TN COMPONENT OF SCIENCE: Unifying Concepts of Science
BENCHMARK Models are often used to represent processes that cannot be directly observed.
Lesson One (This lesson addresses Objectives 1.01, 1.02, and 1.03.)
Photosynthesis is the chemical change that produces food and oxygen in green plants. It is the process of making food by using sunlight. Plants must have chlorophyll (Green pigment) for photosynthesis to take place. Chlorophyll captures the sun's energy which is needed to produce sugar from carbon dioxide. Photosynthesis happens when green plant cells use water, carbon dioxide, and light to make oxygen, food, and waste products. Photosynthesis takes place in the leaf of the plant. Photo means light, synthesis means combine with light.
When plants photosynthesize, they give off oxygen. People need oxygen to live. When we exhale, we give off a gas called carbon dioxide. Our bodies do not use this, but plants do for use during photosynthesis. The equation for photosynthesis is carbon dioxide + water + light and energy/chlorophyll --(sugar + oxygen.) (Show a chart with this formula.) Plants provide oxygen to people and animals through photosynthesis. Plants purify the air by taking out carbon dioxide.
1. What green substance or pigment do plants have that makes photosynthesis possible?
2. For photosynthesis to take place, plants must have __________.
Circle all that apply: sunshine, extended periods of darkness, chlorophyll, groups of other plants, carbon dioxide, pollination, water
3. Draw your own picture showing the process of photosynthesis following these directions:
a. Draw a line for the ground
b. Draw a tree going up from the ground line
c. Draw a root system for the tree
d. Next to the root system, write the following information: "Water and minerals from the soil travel through the roots and stems of plants to mix with chlorophyll and the green leaves"
e. Next to the trunk, write the following information: "The green leaves absorb light energy the sun. Leaves also take in carbon dioxide from the air. The water and minerals combine with carbon dioxide, chlorophyll and sunlight to produce sugar and oxygen. The glucose is the food manufactured by green plants"
f. Draw arrows, going up from the roots, to the top of the tree trunk
g. From the leaves on the tree top, draw an arrow pointing out of the tree and write "oxygen"
h. Draw an arrow pointing into leaves and write "carbon dioxide"
i. Draw a sun with arrows pointing out from it and write "light energy from the sun"
4. Explain the importance of photosynthesis in the life process.
5. If algae provides 90% of the oxygen in the air, what conclusion can be drawn concerning the millions of gallons of oil that have been spilled in our oceans in the past year?
l. Draw a circle.
2. In the bottom of the circle, write carbon dioxide.
3. On the right hand side of the circle draw a plant.
4. Draw an arrow pointing from the words carbon dioxide to the plant.
5. In the top of the circle, write oxygen.
6. Draw an arrow from the plant pointing toward the word oxygen.
7. Draw an animal in the left hand side of the circle.
8. Draw an arrow from the word oxygen pointing to the animal.
9. Draw an arrow from the animals to the words carbon dioxide.
2. Have students contract photosynthesis and respiration by making charts or diagrams. Use resource books if necessary.
1. Photosynthesis takes place only in cells with chlorophyll.
2. Carbon dioxide is taken in.
3. Water is taken in.
4. Food (Sugar) is made.
6. Oxygen is given off.
During the process of respiration
1. Respiration takes place in all cells.
2. Food (Sugar) is broken down.
3. Oxygen is used.
4. Energy stored in sugar is released.
5. Carbon dioxide is produced and given off.
6. What is produced and given off.
(Discuss - When people and animals breathe, they take in oxygen and give off carbon dioxide. Respiration takes place within the cells of all living things.)
(1. RESPIRATION: sugar + oxygen ---->energy + carbon dioxide + water
2. PHOTOSYNTHESIS: water + carbon dioxide + energy ---> sugar + oxygen. They are entirely opposite but they do complement each other.)
Monitor: Check their responses.
a. Make the first square of your cycle strip- Plants breathe in carbon dioxide.
b. Second square-Water is taken in.
c. Fourth square- Sun's energy is stored in sugar.
d. Fifth square-Oxygen is given off.
e. Sixth square-We breathe in oxygen and eat food.
f. Seventh square-Energy stored in sugar is released.
g. Eighth square-Carbon dioxide is produced and given off
h. Cut out strip and tape the first square to the bottom of the eighth square
i. The student could paste onto a can or small box if available. The strip can be turned until the cycle repeats itself over and over.
Plants breathe in carbon dioxide
Food (sugar) is made
Oxygen is given off
We breathe in oxygen and eat food
Energy stored in sugar is released
Carbon dioxide is produced and given off
Cut out strip and attach "A" to "B".
2. How does the cutting of large forests to build subdivisions and shopping centers affect the oxygen-carbon dioxide cycle and life in general?
3. Develop criteria for zoning land for preservation.
4. What do you think will happen if we continue to cut down trees at the rate we are now destroying forest?
5. Plan a model city of the future where all the natural resources are preserved.
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