1. What do you think the experimenters considered as two possible sources for the substances (matter) that became incorporated into new tree growth? (This experiment was performed nearly 300 years ago. People didn't know very much about chemistry, and air was thought to be a non-substance.) QUESTION 2. When the experimenters measured the weight of the two substances (question #1) given to the plant, they found 35 kg of one and 2 kg of the other. Where do you think they thought the rest of the plant's weight came from?

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
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Author:STARR
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Chapter20: The Protists
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Problem 4CT: Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of...
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photosynthesis.
Historical Discovery Process
The chemical changes that occur during photosynthesis have been
investigated for the past 300 years. The general highlights of these
discoveries help us to understand the basic process of photosynthesis.
Three centuries ago people wondered where plants came from. They
knew that plants grew out of the ground, but how that happened was a
complete mystery to them. The first step in answering the question was
to plant a small tree in a large pot supported off the ground. They did this
so that the soil of the container was separated from the soil of the earth.
Only the dirt in the pot was available to the plant.
The people cared for the plant during one year. At the end of the year
the small tree had gained 100 kg. (The actual data from this experiment
have been changed to simplify the discussion.)
1. What do you think the experimenters considered as two possible
sources for the substances (matter) that became incorporated into new
tree growth? (This experiment was performed nearly 300 years ago.
People didn't know very much about chemistry, and air was thought
to be a non-substance.)
? QUESTION
2. When the experimenters measured the weight of the two substances
(question #1) given to the plant, they found 35 kg of one and 2 kg of
the other. Where do you think they thought the rest of the plant's
weight came from?
People guessed that there must be some invisible substance in light
or somewhere else that was added to the plant. It took another century
for humans to discover the chemical makeup of air. Once humans invented
accurate scales, they could measure small changes in the weight of air.
Experimenters put a plant into a sealed jar with air that had been
weighed. After the plant was exposed to light for a few hours, the air lost
weight. They had discovered another source of matter for the new plant
growth-the air! The basic equation for photosynthesis was complete.
Light
O2
New Plant Tissue
COH12O6
and its variations
CO2 + H2O+
a little soil
Energy
light air
heavy air
Transcribed Image Text:photosynthesis. Historical Discovery Process The chemical changes that occur during photosynthesis have been investigated for the past 300 years. The general highlights of these discoveries help us to understand the basic process of photosynthesis. Three centuries ago people wondered where plants came from. They knew that plants grew out of the ground, but how that happened was a complete mystery to them. The first step in answering the question was to plant a small tree in a large pot supported off the ground. They did this so that the soil of the container was separated from the soil of the earth. Only the dirt in the pot was available to the plant. The people cared for the plant during one year. At the end of the year the small tree had gained 100 kg. (The actual data from this experiment have been changed to simplify the discussion.) 1. What do you think the experimenters considered as two possible sources for the substances (matter) that became incorporated into new tree growth? (This experiment was performed nearly 300 years ago. People didn't know very much about chemistry, and air was thought to be a non-substance.) ? QUESTION 2. When the experimenters measured the weight of the two substances (question #1) given to the plant, they found 35 kg of one and 2 kg of the other. Where do you think they thought the rest of the plant's weight came from? People guessed that there must be some invisible substance in light or somewhere else that was added to the plant. It took another century for humans to discover the chemical makeup of air. Once humans invented accurate scales, they could measure small changes in the weight of air. Experimenters put a plant into a sealed jar with air that had been weighed. After the plant was exposed to light for a few hours, the air lost weight. They had discovered another source of matter for the new plant growth-the air! The basic equation for photosynthesis was complete. Light O2 New Plant Tissue COH12O6 and its variations CO2 + H2O+ a little soil Energy light air heavy air
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