Twenty Questions
Photosynthesis and
Cellular Respiration
Twenty Questions:
Photosynthesis and
Respiration
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1. Describe all of the
characteristics of autotrophs.

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Autotrophs are self-feeders.
They are also known as producers.
They use the process of photosynthesis to
convert sunlight into usable energy called
glucose.
Energy is released from the glucose in the
form of ATP through cellular respiration.
2. What is the equation for cellular
respiration?

C6H12O6 6 + 6O2  CO2 + 6H2O + ATP
3. In the photosynthesis and respiration simulation
lab, which test tube illustrated that plants use cellular
respiration?

When the plant was in the test tube in the
dark. The bromothymal blue turned from blue
to yellow in the presence of carbon dioxide.
4. An aquatic snail is placed in a test tube
with bromothymal blue and water. Predict
the color of the water after 24 hours.

Due to cellular respiration, the bromothymal
blue will turn from blue to yellow because of
the carbon dioxide produced.
5. Why is ATP considered a form of
chemical energy?

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Energy is stored between the phosphate
groups. When a phosphate group is
removed, energy is released.
ATP  ADP
6. What are the three parts of an
ATP molecule?

Adenine, ribose, and three phosphate groups
7. What is the stroma and what part of
photosynthesis takes place there?

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The stroma is the thick fluid surrounding the
thylakoid membrane.
The stroma is the site of the light
independent/Calvin Cycle.
8. Where is chlorophyll found?

Chlorophyll is found inside of the thylakoid
membranes.
9. What are three factors that effect the rate
of photosynthesis? How do each affect
photosynthesis?
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Light intensity: the higher the light intensity,
the higher the rate of photosynthesis.
Light color: When the light is colorless, the
rate of the photosynthesis is the highest.
When the light is green, the rate of
photosynthesis is the lowest.
CO2 levels: When the levels are high, the
rate of photosynthesis is also high.
10. What do you need for photosynthesis to
occur?

The reactants are sunlight, carbon dioxide,
and water.
11. During the photosynthesis simulation,
how did we measure the rate of
photosynthesis?

We measured the rate of photosynthesis
through the number of oxygen bubbles
produced by the plant because oxygen is a
product of photosynthesis.
12. In the Photosynthesis and Respiration
Lab, which test tube determined that plants
photosynthesize?

The test tube that determined whether or not
photosynthesis occurred was the test tube
with the Elodea in the light.
13. What is the relationship between
photosynthesis and respiration?

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The reactants of photosynthesis are the
products of respiration.
The reactants of respiration are the products
of photosynthesis.
14. What are the reactants and
products of respiration?

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The reactants are glucose and oxygen.
The products are carbon dioxide, water, and
ATP.
15. In the photosynthesis and respiration
simulation, what would happen if you added five
more plants to the test tube and put them in the
dark?

If there were five more plants, more carbon
dioxide will be produced resulting in a deeper
yellow color.
16. Is ATP reusable?

ATP is reusable because the phosphate
group that is removed and replaced in the
ATP Cycle (ATP  ADP  ATP).
17. Describe all of the
characteristics of heterotrophs.
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Heterotrophs are other-eaters.
They are also known as consumers.
Energy is released from the glucose in the
form of ATP through cellular respiration.
18. What do you think would happen if
there was less carbon dioxide?

If there was less carbon dioxide available to
the plant, the rate of photosynthesis would
decrease.
19. What wavelengths do
chlorophyll absorb?

They absorb every wavelength except green
in the visible light portion of the EM Spectrum
(a little DES for you!).
20. In an ATP molecule, where is
energy stored?

Potential energy is stored between the
phosphate groups.