Photosynthesis Review
1. What is photosynthesis?
Photosynthesis is the process of converting sunlight, carbon dioxide, and water into stored chemical energy (glucose)
and oxygen. This process converts solar energy into chemical energy.
2. Why is photosynthesis important to plants?
Photosynthesis allows plants to build starch, a structural sugar polymer, and glucose which can be broken down into
usable cellular energy.
3. Why is photosynthesis important to animals? (hint: not just oxygen)
Plants are the primary food source of all animals and they produce glucose which is the main molecule used for
cellular respiration in animals.
4. How is photosynthesis related to food chains? What would happen without it?
If photosynthesis was not present the foundational level of the food chain would not be producing the energy needed
to sustain the other levels. It would be like trying to build a house on sand where the other levels can not be
supported.
5. Who does photosynthesis? Where does it happen inside this organism?
Plants, algae and many bacteria perform photosynthesis. This occurs in the chloroplast which is an organelle within
these organisms.
6. What do the root words of photosynthesis mean?
Photo means light and synthesis means to combine
7. What are the initial and final forms of energy for photosynthesis?
Initial is electromagnetic energy in the form of light and the final form is chemical energy stored in the bond of
glucose.
8. What happens to the energy absorbed during photosynthesis?
It is used to excite the electrons in water which causes the molecule to split releasing oxygen, hydrogen ions, and an
electron to travel along the electron transport chain in the thylakoid membrane.
9. What compounds must plants obtain for photosynthesis?
Water and Carbon Dioxide
10. Write a word equation showing the process of photosynthesis.
Sunlight + Carbon Dioxide + Water Yields Glucose and Oxygen
11. Write the balanced chemical equation showing the process of photosynthesis.
Sunlight + 6CO2 + 6O2  C6H12O6 +6 O2
12. How is photosynthesis related to the carbon cycle?
Glucose is released by animals as CO2 which is absorbed by plants and converted back into Glucose. Also, when
plants decay their carbon compounds eventually become fossil fuels.
13. If a large number of plants were removed from an area what effect would that have on the ecosystem/ carbon cycle?
There would be less overall oxygen in the environment making it difficult for animals to breath but the most pressing
issue would be the lack of food for the herbivores which are essential to feed other species.
Cellular Respiration Review
1. Where in the cell does cellular respiration take place?
Mitochondria
2. What is the abbreviation for the high energy molecule produced during cellular respiration?
ATP
3. What are the reactants of cellular respiration?
Glucose and Oxygen
4. What are the products of cellular respiration?
Carbon Dioxide, Water and ATP
5. What was the responding variable in the yeast lab?
The amount of CO2 produced by the yeast
6. This is a bi-product of respiration in the body when done without oxygen.
Lactic Acid
7. Glycolysis produces two- three carbon sugars called –
Pyruvate or pyruvic acid
8. What was a controlled variable in the yeast lab?
Amount of yeast put into each test tube or the temperature where they were stored
9. How many total ATP are produced from one glucose model during cellular respiration? How many NET ATP?
Total= 38 ATP, Net= 36 ATP
10. The first step of cellular respiration is called?
Glycolysis
11. Do plants perform cellular respiration? Explain why or why not.
YES. Plants still need to get energy from the chemical bonds in glucose.
12. Which process would be considered the opposite of cellular respiration?
Photosynthesis
13. Oxygen is an electron acceptor that is only used in this stage of cellular respiration
The electron transport chain
14. What term best describes respiration taking place without oxygen?
Anaerobic Respiration
Try sketching both reactions several times on a piece of scratch paper.
**Answers to these questions will be posted on the district website tonight at roughly 5pm. Good luck Studying!
http://www.cheneysd.org/domain/1018
Or go to the Cheney High School webpage and under the Departments drop down menu select Science. Then Select Biology
from the options on the left hand side of the screen.