What to create	Exam
Which subject	Biology
What age group	Year or Grade 10
What topic	Cellular Respiration and Biochemical ReactionsEnergy Flow through Ecosystems ATP
Question types	Close-ended
Number of questions	30
Number of answers	4
Correct answers	Exactly 1
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Quiz: Cellular Respiration and Energy Flow in Ecosystems

Instructions:

• Choose the best answer for each question.
• Each question has one correct answer.

Questions:

1. What is the primary purpose of cellular respiration? A. To produce glucose
   B. To release energy from food
   C. To absorb sunlight
   D. To transport oxygen

2. Which of the following is a byproduct of cellular respiration?
   A. Oxygen
   B. Water
   C. Carbon dioxide
   D. Both B and C

3. In which part of the cell does glycolysis occur?
   A. Mitochondria
   B. Nucleus
   C. Cytoplasm
   D. Ribosome

4. What is the role of ATP in cellular processes?
   A. Storage of genetic information
   B. Energy currency of the cell
   C. Catalyzing biochemical reactions
   D. Transporting nutrients

5. Which stage of cellular respiration occurs in the mitochondria?
   A. Glycolysis
   B. Krebs Cycle
   C. Fermentation
   D. Both B and C

6. What molecule is the final electron acceptor in the electron transport chain?
   A. Carbon dioxide
   B. Glucose
   C. Oxygen
   D. Water

7. How many ATP molecules are produced in glycolysis?
   A. 4
   B. 2
   C. 36
   D. 38

8. What is the process of converting glucose to ethanol and carbon dioxide called?
   A. Cellular respiration
   B. Lactic acid fermentation
   C. Alcoholic fermentation
   D. Aerobic respiration

9. Which of the following processes does NOT require oxygen?
   A. Aerobic respiration
   B. Anaerobic respiration
   C. Krebs cycle
   D. Electron transport chain

10. What energy-rich molecule is produced during the light-dependent reactions of photosynthesis?
    A. NADH
    B. ATP
    C. Glucose
    D. Oxygen

11. Where does the Krebs cycle take place?
    A. Nucleus
    B. Cytoplasm
    C. Mitochondrial matrix
    D. Chloroplast

12. What is the net gain of ATP from one molecule of glucose during aerobic respiration?
    A. 2
    B. 20
    C. 32
    D. 38

13. Which gas is released during cellular respiration?
    A. Nitrogen
    B. Helium
    C. Oxygen
    D. Carbon dioxide

14. What role does NADH play in cellular respiration?
    A. It stores energy
    B. It is an electron carrier
    C. It catalyzes reactions
    D. It is a source of glucose

15. Which of these organisms depend on aerobic cellular respiration?
    A. Yeast
    B. Plants
    C. Animals
    D. Both B and C

16. What is the main source of energy for most ecosystems?
    A. Water
    B. Sunlight
    C. Soil minerals
    D. Oxygen

17. In which process do plants convert carbon dioxide and water into glucose and oxygen?
    A. Photosynthesis
    B. Cellular respiration
    C. Fermentation
    D. Digestion

18. How does energy flow through an ecosystem?
    A. In a cyclic manner only
    B. In a linear fashion
    C. In a chaotic pattern
    D. It doesn’t flow

19. What is the role of decomposers in an ecosystem?
    A. Producing energy
    B. Consuming producers
    C. Recycling nutrients
    D. Competing with plants

20. Which of the following pathways occurs in the presence of oxygen?
    A. Fermentation
    B. Anaerobic respiration
    C. Aerobic respiration
    D. Both A and B

21. What is produced during lactic acid fermentation?
    A. Glucose
    B. Ethanol
    C. Lactic acid
    D. Carbon dioxide

22. How do plants recycle oxygen?
    A. Through cellular respiration
    B. During photosynthesis
    C. In the soil
    D. Through transpiration

23. What is the ATP yield from one glucose molecule during anaerobic respiration?
    A. 2
    B. 6
    C. 18
    D. 36

24. Which factor does NOT affect the rate of cellular respiration?
    A. Temperature
    B. pH
    C. Light intensity
    D. Substrate availability

25. What is the main function of the electron transport chain?
    A. To synthesize glucose
    B. To generate ATP
    C. To absorb light
    D. To store energy

26. Which of the following organisms undergo fermentation?
    A. Bears
    B. Bacteria
    C. Trees
    D. Birds

27. How is energy stored in ATP?
    A. As glucose
    B. In the bonds between phosphate groups
    C. As carbon dioxide
    D. In the ribose sugar

28. What does the term "aerobic" imply?
    A. Requires water
    B. Requires oxygen
    C. Does not require energy
    D. Requires carbon dioxide

29. What is the end product of the Krebs cycle?
    A. Glucose
    B. Oxygen
    C. Pyruvate
    D. Carbon dioxide

30. How many molecules of NADH are generated during one cycle of the Krebs cycle?
    A. 1
    B. 2
    C. 3
    D. 4

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Correct Answers:

1. B
2. D
3. C
4. B
5. B
6. C
7. B
8. C
9. B
10. B
11. C
12. C
13. D
14. B
15. D
16. B
17. A
18. B
19. C
20. C
21. C
22. B
23. A
24. C
25. B
26. B
27. B
28. B
29. D
30. C