Photosynthesis and Early Experiments Reading

Chloroplasts are at which level of hierarchical organization?

• molecule

• organelle

• cell

• organ

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Tap on the chloroplast.

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• 6
• CO2
• 3
• 1
• O2
• glucose
• 2

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Because plants synthesize their own glucose, they are not consumers but ___.

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Both of these processes - burning candles and animals breathing - "damaged" the air by ___.

• consuming oxygen

• reacting with carbon dioxide

• creating nitrogen gas

• producing oxygen

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Jan Ingenhousz's discoveries support the idea that the highest density of chloroplasts is probably found in a plant's ___.

• colorful flower petals

• green leaves

• roots

• seeds pre-germination

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Engelmann's research demonstrated that ​ (a)   and ​red light are highly ​ (b)   . This leads us to infer that in green plants, green light is probably mostly ​ (c)   .

• blue
• absorbed
• reflected
• yellow
• transmitted
• green

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Following radioactively tagged carbon atoms from CO₂ molecules that enter a plant to glucose molecules later produced by that plant demonstrates which law?

• Law of Conservation of Energy

• Law of Conservation of Mass

• First Law of Thermodynamics

• Law of Entropy

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Categorize the experiments by what they best provide evidence of.

Groups:

(a) Production of Glucose/Oxygen

,

(b) Plants Require Light

• Theodor Engelmann's experiments

• Joseph Priestley's experiments

• Theodor Engelmann's experiment

• Benson and Calvin's experiment

• Jan Ingenhousz's experiments

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What is the main idea of the passage?

• Photosynthesis is a process that uses light, carbon dioxide, and water to produce glucose and oxygen, which are essential for life on Earth.

• Early experiments by scientists such as Benson, Calvin, and others helped discover that plants absorb light for food production.

• The chloroplasts in plant cells are the only part responsible for photosynthesis.

• The process of photosynthesis is a recent discovery made with radioactive isotopes.

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