Chapter 2: Respiration – The Energy Producing System — Online MCQ Test
BIOLOGY · CLASS 10th · Telangana State Board
Practice Chapter 2: Respiration – The Energy Producing System with a free chapter-wise online MCQ test.
This chapter covers: Focusing on cellular energy release this chapter details how breakdown of glucose produces ATP (adenosine triphosphate). It covers both aerobic and anaerobic respiration (fermentat....
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Chapter 2: Respiration – The Energy Producing System — Important Questions & Answers
What is the primary function of ATP in cellular respiration?
- A. To store and release energy for cellular activities
- B. To break down glucose molecules
- C. To transport oxygen across cell membranes
- D. To regulate body temperature
Answer: A. To store and release energy for cellular activities
ATP (adenosine triphosphate) is the universal energy currency of cells, storing energy in high-energy phosphate bonds that are released when needed for cellular work.
ATP (adenosine triphosphate) is the universal energy currency of cells, storing energy in high-energy phosphate bonds that are released when needed for cellular work.
Which of the following is the correct definition of aerobic respiration?
- A. Breakdown of glucose without oxygen producing lactic acid
- B. Breakdown of glucose in the presence of oxygen producing CO₂, H₂O, and energy
- C. Breakdown of glucose in mitochondria producing only ATP
- D. Breakdown of amino acids in the presence of oxygen
Answer: B. Breakdown of glucose in the presence of oxygen producing CO₂, H₂O, and energy
Aerobic respiration is the process where glucose is completely oxidized in the presence of oxygen, producing carbon dioxide, water, and large amounts of ATP.
Aerobic respiration is the process where glucose is completely oxidized in the presence of oxygen, producing carbon dioxide, water, and large amounts of ATP.
How does cellular respiration differ from combustion in terms of energy release?
- A. Cellular respiration releases energy all at once; combustion releases it gradually
- B. Cellular respiration releases energy gradually in controlled steps; combustion releases energy suddenly as heat
- C. Both release energy in exactly the same way
- D. Combustion requires enzymes; cellular respiration does not
Answer: B. Cellular respiration releases energy gradually in controlled steps; combustion releases energy suddenly as heat
Cellular respiration releases energy in small, controlled steps through enzymatic reactions allowing ATP synthesis, while combustion releases energy suddenly and wastefully as heat.
Cellular respiration releases energy in small, controlled steps through enzymatic reactions allowing ATP synthesis, while combustion releases energy suddenly and wastefully as heat.
Why do muscles produce lactic acid during intense exercise rather than continuing aerobic respiration?
- A. Because oxygen is temporarily insufficient to meet energy demands
- B. Because aerobic respiration is too slow for intense activity
- C. Because muscles prefer anaerobic respiration
- D. Because the mitochondria shut down during exercise
Answer: A. Because oxygen is temporarily insufficient to meet energy demands
During intense exercise, oxygen supply to muscles becomes temporarily insufficient, forcing a shift to anaerobic respiration which produces lactic acid, causing the 'burn' sensation.
During intense exercise, oxygen supply to muscles becomes temporarily insufficient, forcing a shift to anaerobic respiration which produces lactic acid, causing the 'burn' sensation.
A marathon runner experiences muscle cramps after 2 hours of continuous running despite adequate oxygen intake. Which physiological explanation BEST accounts for this phenomenon?
- A. Accumulation of lactic acid from periods of localized anaerobic respiration in overworked muscle fibers
- B. Complete depletion of all ATP in muscle cells
- C. Permanent damage to mitochondrial structure
- D. Inability to perform aerobic respiration after prolonged exercise
Answer: A. Accumulation of lactic acid from periods of localized anaerobic respiration in overworked muscle fibers
Even with adequate oxygen, certain muscle fibers working at maximum capacity undergo brief periods of anaerobic respiration producing lactic acid accumulation, causing muscle fatigue and cramping.
Even with adequate oxygen, certain muscle fibers working at maximum capacity undergo brief periods of anaerobic respiration producing lactic acid accumulation, causing muscle fatigue and cramping.