Ecosystems: Matter & Energy - Lesson 4

Which of the following claims describes the relationship between solar radiation (independent variable) and photosynthesis (dependent variable) based on the images?

• A greater amount of solar radiation is associated with a lesser amount of photosynthesis.
• The amount of solar radiation does not matter; the amount of photosynthesis is always the same.
• A lesser amount of solar radiation is associated with a greater amount of photosynthesis.
• A greater amount of solar radiation is associated with a greater amount of photosynthesis.

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NGSS.HS-LS1-5

11.000 years ago, the Earth’s tilt was greater than it is today. Which of the following best explains the relationship between the Earth’s tilt and plant matter in the zombie fire system?

• The greater tilt caused more solar radiation in the Arctic, which led to more photosynthesis and more matter and energy stored in plants.
• The lesser tilt caused more solar radiation in the Arctic, which led to more photosynthesis and more matter and energy stored in plants.
• The greater tilt caused less solar radiation in the Arctic, which led to more photosynthesis and more matter and energy stored in plants.
• The greater tilt caused more solar radiation in the Arctic, which led to more photosynthesis and less matter and energy stored in plants.

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Describe a time in your own life when you experienced an increase or decrease in solar radiation and how it impacted you.

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Which of the following could help us generate evidence to help us make a claim that changes in solar radiation cause changes in photosynthesis?

• Carry out an investigation where we vary the amount of light and measure the amount of sugar produced through photosynthesis.
• Carry out an investigation where we vary the temperature and measure the amount of sugar produced through photosynthesis.
• Carry out an investigation where we vary the temperature and amount of light and measure the amount of CO2 produced through photosynthesis.

• Carry out an investigation where we vary the amount of light and measure the amount of carbon dioxide produced through photosynthesis.

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When choosing a claim, how did you use the dependent and independent variables to think about cause and effect?

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How did thinking about changes to the flow of energy and matter help you explain the lesson question: How did so much plant energy and matter get into the peat in the zombie fire system?

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How have you collaborated with your peers to figure out science ideas over the course of the lesson?

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What would most likely happen if an ecosystem no longer received sunlight?

• The number of herbivores would increase
• The number of plants would increase
• all organisms would adapt
• All living organisms would eventually die

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Which best describes how energy from the sun helps to maintain life on Earth?

• It heats Earth's atmosphere and surface, which helps stabilize temperatures on Earth and creates environments more favorable for life to exist

• It forms the ocean's water and the oxygen in the atmosphere that organisms need for life functions

• It prevents destruction of the magnetic field around the Earth that protects all life forms

• It is absorbed by Earth's mantle, which drives plate tectonics to form new land masses for organisms to live

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What is photosynthesis?

• The process by which plants eat insects

• The process by which plants release oxygen

• The process by which plants convert sunlight into chemical energy

• The process by which plants absorb water through their leaves

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