Looking for Photosynthesis

Question

Hopefully by now you understand the reactants and the products of photosynthesis. Watch this series of videos to see proof that photosynthesis occurs and gases (carbon dioxide and oxygen) are exchanged during the process of photosynthesis.
Investigation 1: Using bromothymol blue to prove photosynthesis
Watch the video below to understand how a chemical called bromothymol blue can be used to show the absence and presence of carbon dioxide gas. Afterwards, use the video to answer the multiple choice questions that follow.
Video Player

Question 1
The initial color of the bromothymol blue solution is blue. What does a blue color represent?(1 point)
Responses

The absence of carbon dioxide
The absence of carbon dioxide

The presence of carbon dioxide
The presence of carbon dioxide
Question 2
Using a straw to blow into the bromothymol blue solution eventually turns the solution a green color. What gas is being blown into the solution that causes it to turn green?(1 point)
Responses

oxygen
oxygen

fossil fuels
fossil fuels

nitrogen
nitrogen

carbon dioxide
carbon dioxide
Question 3
What color will the water be if photosynthesis has occurred?(1 point)
Responses

yellow
yellow

blue
blue

red
red

purple
purple
Question 4
Read the following description of Tube #4:

Tube #4 contains:

Bromothymol blue (BTB)
Carbon dioxide
Not exposed to light
No Elodea present
Initially yellow-green in color
After 24 hours, Tube #4 is still yellow-green in color. Which of the answer choices below describes why?

(1 point)
Responses

Tube #4 is still yellow-green in color because it performed photosynthesis.
Tube #4 is still yellow-green in color because it performed photosynthesis.

Tube #4 is still yellow-green in color because the carbon dioxide was absorbed.
Tube #4 is still yellow-green in color because the carbon dioxide was absorbed.

Tube #4 is still yellow-green in color because it was unable to perform photosynthesis.
Tube #4 is still yellow-green in color because it was unable to perform photosynthesis.

Tube #4 is still yellow-green in color because carbon dioxide was released.
Tube #4 is still yellow-green in color because carbon dioxide was released.
Question 5
Read the following description of Tube #2:

Tube #2 contains:

Bromothymol blue (BTB)
Carbon dioxide
Exposed to light
Elodea present
Initially yellow-green in color
After 24 hours, Tube #2 is now blue in color. In 1-2 sentences explain why.

(2 points)
0 / 500 Word Limit
Investigation 2: Using bubbles to quantify photosynthesis
Watch the video here to truly understand what this investigation might look like in real life. Afterwards, use the video to answer the questions that follow.
Video Player

Question 6
During preparation, baking soda (NaHCO3
) is added to the water to create a solution. Which of the options below is the best reason why baking soda was added?(1 point)
Responses

To add oxygen to the solution that the plant needs as a reactant of photosynthesis
To add oxygen to the solution that the plant needs as a reactant of photosynthesis

To add carbon dioxide to the solution that the plant needs as a reactant of photosynthesis
To add carbon dioxide to the solution that the plant needs as a reactant of photosynthesis

To keep the elodea plant from decaying
To keep the elodea plant from decaying

To keep the water from changing into another color
To keep the water from changing into another color
Question 7
During the first portion of the experiment, the lights were turned off and a timer was set for 5 minutes. No bubbles were released during this 5 minutes. Which of the answer choices below is the best reason why. (1 point)
Responses

There was no light present for photosynthesis to occur
There was no light present for photosynthesis to occur

There was no oxygen present for photosynthesis to occur
There was no oxygen present for photosynthesis to occur

There was no carbon dioxide present for photosynthesis to occur
There was no carbon dioxide present for photosynthesis to occur
Question 8
During the second part of the experiment you can see bubbles begin to appear when they didn't before. Which of the answer choices below is the best reason why?(1 point)
Responses

Oxygen was present in the water when it wasn't before
Oxygen was present in the water when it wasn't before

Carbon dioxide was present in the water when it wasn't before
Carbon dioxide was present in the water when it wasn't before

Light was applied to the scenario so photosynthesis could occur
Light was applied to the scenario so photosynthesis could occur
Question 9
Use the data table below to answer the following multiple choice questions.

What trend can be observed in the number of bubbles produced during Trial 1 over the 10-minute period?

(1 point)
Responses

The number of bubbles decreases steadily.
The number of bubbles decreases steadily.

The number of bubbles increases steadily.
The number of bubbles increases steadily.

The number of bubbles increases at first, then decreases.
The number of bubbles increases at first, then decreases.

The number of bubbles remains constant.
The number of bubbles remains constant.
Question 10
The purpose of these two investigations was to show gas exchange during photosynthesis. In 3-5 sentences explain why two investigations are needed to show gas exchange during photosynthesis?(4 points)
0 / 500 Word Limit
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Answer 1

Sure! Here are the answers to your questions based on the details provided regarding photosynthesis:

Investigation 1: Using bromothymol blue to prove photosynthesis

Question 1:
The initial color of the bromothymol blue solution is blue. What does a blue color represent?
Response: The absence of carbon dioxide.

Question 2:
Using a straw to blow into the bromothymol blue solution eventually turns the solution a green color. What gas is being blown into the solution that causes it to turn green?
Response: Carbon dioxide.

Question 3:
What color will the water be if photosynthesis has occurred?
Response: Blue.

Question 4:
Tube #4 is still yellow-green in color because it was unable to perform photosynthesis.
Response: Tube #4 is still yellow-green in color because it was unable to perform photosynthesis.

Question 5:
Tube #2 is now blue in color because the Elodea plant conducted photosynthesis in the presence of light, consuming carbon dioxide and releasing oxygen. This resulted in the removal of carbon dioxide from the solution, turning it blue.

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Investigation 2: Using bubbles to quantify photosynthesis

Question 6:
Which of the options below is the best reason why baking soda was added?
Response: To add carbon dioxide to the solution that the plant needs as a reactant of photosynthesis.

Question 7:
Which of the answer choices below is the best reason why no bubbles were released during the first 5 minutes?
Response: There was no light present for photosynthesis to occur.

Question 8:
Which of the answer choices below is the best reason why bubbles began to appear during the second part of the experiment?
Response: Light was applied to the scenario so photosynthesis could occur.

Question 9:
What trend can be observed in the number of bubbles produced during Trial 1 over the 10-minute period?
Response: The number of bubbles increases steadily.

Question 10:
The purpose of these two investigations was to show gas exchange during photosynthesis. Two investigations are needed to provide a comprehensive understanding of the process. The first investigation utilizing bromothymol blue visualizes the presence or absence of carbon dioxide and changes in pH, while the second investigation quantifies the rate of photosynthesis by measuring the production of oxygen in the form of bubbles. Combining both methods allows for a clear demonstration of gas exchange and the conditions required for photosynthesis to occur.

Feel free to modify any answers to better fit your understanding or any specific instructions you may have!

Answer 2

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