Online Test — Respiration in Plants
15 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 15
The energy currency of the cell is:
DNA
ATP
Glucose
Oxygen
Explanation: ATP is the universal energy currency of the cell.
Question 2 of 15
The aerobic respiration equation is essentially the reverse of:
Transpiration
Photosynthesis
Osmosis
Fermentation
Explanation: Respiration reverses the overall photosynthesis equation.
Question 3 of 15
Glycolysis takes place in the:
Mitochondria
Cytoplasm
Nucleus
Chloroplast
Explanation: Glycolysis occurs in the cytoplasm.
Question 4 of 15
Glycolysis splits one glucose into two molecules of:
Lactic acid
Pyruvic acid
Ethanol
Acetyl-CoA
Explanation: Glucose is split into two pyruvic acid molecules.
Question 5 of 15
Does glycolysis require oxygen?
Yes, always
No, it is anaerobic
Only in plants
Only at night
Explanation: Glycolysis does not require oxygen.
Question 6 of 15
Aerobic respiration occurs mainly in the:
Cytoplasm
Mitochondria
Nucleus
Vacuole
Explanation: The Krebs cycle and ETC occur in the mitochondria.
Question 7 of 15
The Krebs cycle is also known as the:
Calvin cycle
Citric acid cycle
Nitrogen cycle
Cell cycle
Explanation: The Krebs cycle is the citric acid (TCA) cycle.
Question 8 of 15
In the electron transport chain, the final electron acceptor is:
Carbon dioxide
Oxygen
Water
Glucose
Explanation: Oxygen is the final electron acceptor, forming water.
Question 9 of 15
Aerobic respiration of one glucose yields about:
2 ATP
4 ATP
36-38 ATP
100 ATP
Explanation: Aerobic respiration yields about 36-38 ATP per glucose.
Question 10 of 15
Fermentation takes place when:
Oxygen is plentiful
Oxygen is absent
Light is present
Water is absent
Explanation: Fermentation (anaerobic respiration) occurs without oxygen.
Question 11 of 15
In yeast, anaerobic respiration produces ethanol and:
Lactic acid
Carbon dioxide
Oxygen
Glucose
Explanation: Yeast produces ethanol and carbon dioxide.
Question 12 of 15
In tired muscle cells without enough oxygen, pyruvate is converted to:
Ethanol
Lactic acid
Glucose
Starch
Explanation: Muscle cells form lactic acid during anaerobic respiration.
Question 13 of 15
The ratio of CO₂ released to O₂ used is the:
Respiratory quotient
Water potential
Turgor pressure
Photoperiod
Explanation: RQ is the ratio of CO₂ released to O₂ consumed.
Question 14 of 15
The RQ for carbohydrates is:
0.7
0.9
1
0
Explanation: Carbohydrates give RQ = 1.
Question 15 of 15
A respiratory pathway that both breaks down and builds up molecules is:
Catabolic only
Anabolic only
Amphibolic
Inert
Explanation: The respiratory pathway is amphibolic.