This set of Human Physiology Multiple Choice Questions & Answers (MCQs) focuses on “Breathing and Exchange of Gases – Respiration and its Types”.
1. Which of the following is true for aerobic respiration in humans?
a) Glucose + water = carbon dioxide + water
b) Glucose + oxygen = Carbon dioxide + water
c) Glucose = Carbon dioxide + water
d) None of the mentioned
View Answer
Explanation: Aerobic respiration is the process of producing cellular energy involving oxygen. The first step is glycolysis. Glucose and oxygen react to produce carbon dioxide and water.
2. Respiration results in ___________
a) Release of oxygen
b) Anabolism
c) Release of carbon dioxide
d) Transfer of carbon dioxide
View Answer
Explanation: Respiration is the movement of oxygen from outside environment to cells and transport of carbon dioxide in the opposite direction. Respiration results in release of carbon dioxide from the body.
3. During hibernation frogs respire through ________
a) Gills
b) Lungs
c) Tympanum
d) Integument
View Answer
Explanation: Frogs hibernate to escape freezing temperatures. During hibernation frogs respire through integument.
4. In which of the following animal respiration occur without any respiration organs?
a) Frog
b) Fish
c) Cockroach
d) Earthworm
View Answer
Explanation: Earthworm is a tube shaped segmented worm. It is classified into annelid. It lacks respiration organs. Respiration occurs through skin.
5. Fishes respire through skin.
a) True
b) False
View Answer
Explanation: Fishes do not respire through skin. They have gills which help them in breathing.
6. The product of glycolysis is ________
a) Pyruvate
b) Lactic acid
c) NADH
d) Acetyl coA
View Answer
Explanation: The end product of glycolysis is pyruvate. It is made from glucose.
7. Where in the cell most of the aerobic respiration takes place?
a) Mitochondria
b) Nucleus
c) Ribosome
d) Cytoplasm
View Answer
Explanation: Mitochondria is the power house of the cell. Most of the aerobic respiration occurs in mitochondria. It is double layered organelle.
8. Which of the following occurs both in photosynthesis and respiration?
a) Krebs cycle
b) Glycolysis
c) Calvin cycle
d) Chemiosmosis
View Answer
Explanation: Krebs cycle is a series of chemical reactions to release stored energy. It is also known as citric acid cycle.
9. Which of the following is true for anaerobic respiration?
a) Glucose + lactic acid = carbon dioxide + water
b) Glucose= Lactic acid + carbon dioxide
c) Glucose gives lactic acid
d) None of the mentioned
View Answer
Explanation: Anaerobic respiration occurs during a lack of oxygen. It is used when there is not enough oxygen present.
10. Catabolic processes ___________
a) Make complex molecules
b) Break complex molecules
c) Occur in autotrophs
d) Occur in heterotrophs
View Answer
Explanation: Catabolism is a process of breaking down of complex molecules to form simpler ones. They release energy.
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