During photosynthesis, the oxygen in glucose comes from:
Correct answer: B. Carbon dioxide
- A. Water
- B. Carbon dioxide
- C. Oxygen in air
- D. Both from water and carbon dioxide
Explanation
Carbon dioxide (CO2) is one of the reactants in photosynthesis. It is taken in by the plant from the atmosphere through tiny pores called stomata on the surface of leaves. Carbon dioxide is reduced in the light-independent reactions (Calvin cycle) using the energy and electrons generated in the light-dependent reactions. The carbon atoms from carbon dioxide are used to build glucose (C6H12O6).
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
Practise Bioenergetics
1,378 free Bioenergetics MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Bioenergetics questions
Both glucose and the appropriate enzymes are necessary for glycolysis to begin. Which additional compound must also be present?
Where are the enzymes located that are involved in the chemical reactions that occur during glycolysis?
How many moles of carbon dioxide are produced by the complete oxidation of 1 mole of pyruvate?
Photosynthesis consists of essentially two biological reaction systems, one following the other. The second of these systems does which of the following?
The process in which water is split during photosynthesis and essential for photosynthesis:
The first step in photosynthesis is: