Green Machine Reading The Green Machine
Guided Reading & Investigation
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Nature's Solar Chefs
Unlike animals, plants don't go to the grocery store when they are hungry. Instead, they are the ultimate "solar chefs." Through a remarkable process called photosynthesis, plants use sunlight, water, and a gas called carbon dioxide to cook up their own food.
This process happens mostly in the leaves. Inside plant cells are tiny structures called chloroplasts, which contain a green pigment called chlorophyll. Chlorophyll acts like a solar panel, capturing energy from the sun. The plant combines this energy with water from its roots and carbon dioxide from the air to create glucose—a type of sugar that provides energy for the plant to grow.
As a "waste product," plants release oxygen back into the atmosphere. This is why plants are essential for life on Earth; they provide the food at the base of the food chain and the oxygen we breathe! Scientists call plants producers because they produce their own food energy.
Checking the Facts
1. Based on the text, what are the three "ingredients" a plant needs for photosynthesis?
2. Where in the plant does photosynthesis primarily take place, and what specific part captures the sunlight?
3. Why are plants called "producers"? Use evidence from the text to support your answer.
Deep Dive: Oxygen Producers
Read the following short excerpt about an experiment and answer the questions that follow.
"In 1774, scientist Joseph Priestley placed a mint plant into a glass container with a candle. Usually, a candle burns out quickly in a sealed jar because it uses up all the oxygen. However, when the plant was present, the candle kept burning for a long time. Priestley concluded that the plant was 'restoring' the air."
4. What "waste product" of photosynthesis was the mint plant releasing into the jar?
Carbon Dioxide
Oxygen
Glucose
Water Vapor
Critical Thinking
If you were to cover the jar with a thick, dark cloth so no light could get in, what would likely happen to the candle? Explain your reasoning using what you know about photosynthesis.
Plant Power Investigations Worksheet Plant Power Investigations
Data Analysis & Modeling
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Lab Results: The Sunlight Variable
A group of fifth-grade scientists conducted an experiment to see how sunlight affects plant growth. They used three identical bean plants and gave them the same amount of water, but different amounts of light over 14 days.
Condition Day 1 Height (cm) Day 7 Height (cm) Day 14 Height (cm) Plant A: Full Sunlight 2.0 cm 5.5 cm 12.2 cm Plant B: Partial Shade 2.0 cm 3.8 cm 7.5 cm Plant C: No Sunlight (Dark Closet) 2.0 cm 2.2 cm 2.3 cm
1. Based on the table, which plant grew the most? How many total centimeters did it grow from Day 1 to Day 14?
2. Compare Plant A and Plant C. Why do you think Plant C grew so much less than Plant A? Use the term photosynthesis in your answer.
3. Looking at the Day 14 data, predict what would happen to Plant B if it was moved to the dark closet for the next week. Explain your reasoning.
The Living Pyramid
Energy flows through an ecosystem from the sun to various organisms. Use the diagram below to answer the questions.
Level 4
Apex Predators (e.g. Hawks)
Level 3
Secondary Consumers
Level 2
Herbivores
Level 1: Producers (Plants)
Producers
4. Categorize the organisms below into their consumer levels:
Grasshopper (eats grass)
Owl (eats mice)
Clover Plant
Snake (eats frogs)
5. Short Answer: What would happen to the rest of the pyramid if the Producers (Level 1) suddenly disappeared? Use the concept of energy flow to explain your answer.
Plant Power Quiz Plant Power Quiz
Assessment: Photosynthesis & Energy Flow
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Part 1 Multiple Choice
1. What are the three primary inputs required for a plant to perform photosynthesis?
Sugar, Oxygen, and Soil
Sunlight, Water, and Carbon Dioxide
Insects, Rain, and Minerals
Chlorophyll, Glucose, and Wind
2. Which organism is always at the base of an energy pyramid?
Apex Predator
Primary Consumer
Producer
Decomposer
Part 2 Matching
Match the vocabulary word to its correct description by writing the letter on the line.
Chlorophyll
A. An organism that eats only plants for energy.
Herbivore
B. The sugar produced by plants during photosynthesis.
Glucose
C. The green pigment that captures light energy.
Oxygen
D. A gas released as a waste product by plants.
Part 3 Short Answer Summary
Explain why energy decreases as you move up from the bottom to the top of an energy pyramid. Use evidence from your class investigation.
Plant Power Answer Key Teacher Answer Key
Plant Power Nutrition Lesson
Material: Green Machine Reading
1. Three Ingredients: Sunlight, Water, and Carbon Dioxide.
2. Location/Part: Happens in the leaves. Chlorophyll (inside chloroplasts) captures the sunlight.
3. Producers: They are called producers because they "produce their own food energy" (glucose) rather than eating other organisms.
4. Multiple Choice: Oxygen.
Critical Thinking: The candle would go out. Without light, the plant cannot perform photosynthesis, meaning it would stop "restoring" the oxygen that the candle needs to burn.
Material: Plant Power Investigations
1. Growth: Plant A (Full Sunlight). It grew 10.2 cm (12.2 - 2.0).
2. Comparison: Plant A had the light energy needed for photosynthesis to create food for growth. Plant C had no light, so it could not perform photosynthesis and barely grew.
3. Prediction: Plant B's growth would slow down or stop. Without light, it can no longer produce glucose for energy.
4. Categorization:
5. Short Answer: The entire food chain would collapse. Since producers are the only ones that "make" energy from the sun, all consumers would eventually run out of food energy.
Material: Plant Power Quiz
B (Sunlight, Water, Carbon Dioxide)
C (Producer)
Matching: Chlorophyll (C), Herbivore (A), Glucose (B), Oxygen (D)
Summary: Energy is lost at each level (mostly as heat). Only about 10% of energy is passed up, so there is less energy available for organisms at the top.
