Engineers have designed a smaller version of such a container that can be used to seal off a small part of the plant. One version of this device, called a leaf chamber, is shown below. When a scientist uses this device on a plant, they don’t need to break the leaves off the branch or stem they are attached to.  The leaf chamber makes an airtight seal around the stem or branch even though it is sticking out of the chamber. Using this device, scientists detected the most change in O2 and CO2 levels inside the chamber when a leaf is in the chamber. They only detected a small change in O2 and CO2 levels in the chamber when a green stem

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Chapter7: Cellular Respiration: Harvesting Chemical Energy
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Engineers have designed a smaller version of such a container that can be used to seal off a small part of the plant. One version of this device, called a leaf chamber, is shown below. When a scientist uses this device on a plant, they don’t need to break the leaves off the branch or stem they are attached to.  The leaf chamber makes an airtight seal around the stem or branch even though it is sticking out of the chamber.

Using this device, scientists detected the most change in O2 and CO2 levels inside the chamber when a leaf is in the chamber. They only detected a small change in O2 and CO2 levels in the chamber when a green stem was placed in the chamber. No change was detected when a root or a brown stem was placed in the chamber. 

Why do you think a scientist would prefer not to remove the leaves from a tree or a plant in order to take these sorts of measurements?

 

6:14
INVESTIGATION A
In lesson 2, you analyzed data of CO₂ and O₂ levels
in a sealed glass container (Modern Bell Jar
Experiment). It is absolutely necessary for the glass
container to be sealed so that we can be sure that
changes in the CO₂ or O₂ levels are caused only by
the objects inside the container.
Engineers have designed a smaller version of such a
container that can be used to seal off a small part of
the plant. One version of this device, called a leaf
chamber, is shown below. When a scientist uses
this device on a plant, they don't need to break the
leaves off the branch or stem they are attached to.
The leaf chamber makes an airtight seal around the
stem or branch even though it is sticking out of the
chamber.
Transcribed Image Text:6:14 INVESTIGATION A In lesson 2, you analyzed data of CO₂ and O₂ levels in a sealed glass container (Modern Bell Jar Experiment). It is absolutely necessary for the glass container to be sealed so that we can be sure that changes in the CO₂ or O₂ levels are caused only by the objects inside the container. Engineers have designed a smaller version of such a container that can be used to seal off a small part of the plant. One version of this device, called a leaf chamber, is shown below. When a scientist uses this device on a plant, they don't need to break the leaves off the branch or stem they are attached to. The leaf chamber makes an airtight seal around the stem or branch even though it is sticking out of the chamber.
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