Respiration — Homi Bhabha Exam Biology MCQs with Solutions
Free Homi Bhabha Exam Biology Respiration MCQs with step-by-step solutions (7 questions). Part of Life Processes. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Respiration · medium · theory
The type of respiration that takes place in the presence of oxygen is called:
A. transpiration
B. fermentation
C. anaerobic respiration
D. aerobic respiration ✓ Correct
Solution: Aerobic respiration uses oxygen and releases more energy than anaerobic respiration.
Q2 — Respiration · hard · theory
Anaerobic respiration in yeast produces carbon dioxide and:
A. water only
B. lactic acid
C. oxygen
D. ethanol (alcohol) ✓ Correct
Solution: Yeast carries out fermentation, producing ethanol and CO₂.
Q3 — Respiration · hard · theory
During vigorous exercise, the anaerobic respiration in our muscles produces:
A. carbon dioxide only
B. glucose
C. lactic acid ✓ Correct
D. ethanol
Solution: When oxygen is scarce, muscle cells form lactic acid, which causes cramps.
Q4 — Respiration · medium · theory
The organelle where most of the energy is released during respiration is the:
A. ribosome
B. nucleus
C. mitochondrion ✓ Correct
D. chloroplast
Solution: Mitochondria are the sites of aerobic respiration, releasing energy as ATP.
Q5 — Respiration · hard · theory
Which statement correctly distinguishes breathing from respiration?
A. Breathing is a physical process; respiration is a chemical process that releases energy ✓ Correct
B. They are exactly the same
C. Breathing releases energy from food
D. Respiration is only physical
Solution: Breathing is the physical exchange of gases, while respiration is the chemical breakdown of food to release energy.
Q6 — Respiration · medium · theory
Respiration releases energy by the breakdown of:
A. water
B. oxygen
C. glucose ✓ Correct
D. carbon dioxide
Solution: Glucose is oxidised during respiration to release energy stored in it.
Q7 — Respiration · hard · theory
Which of the following is TRUE about plants?
A. Plants only photosynthesise
B. Plants respire all the time, taking in oxygen and giving out carbon dioxide ✓ Correct
C. Plants respire only in sunlight
D. Plants never respire
Solution: Plants respire continuously (day and night), while photosynthesis occurs only in light.