Question:
Who first suggested that the oxygen evolved by green plants comes from water and not from carbon dioxide?
Who first suggested that the oxygen evolved by green plants comes from water and not from carbon dioxide?
Show Hint
Photolysis of water during light reaction releases oxygen in photosynthesis.
Updated On: Mar 6, 2026
- Robert Hill
- C. Van Neil
- Park and Biggins
- Dr. Arnon
Hide Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding photosynthetic oxygen evolution.
Photosynthesis releases oxygen as a by-product, but the actual source of this oxygen was a subject of scientific investigation.
Step 2: Contribution of C. Van Neil.
C. Van Neil studied photosynthetic bacteria and proposed that oxygen released during photosynthesis originates from water molecules, not from carbon dioxide.
Step 3: Supporting evidence.
Later experiments using isotopic oxygen confirmed Van Neil’s hypothesis.
Step 4: Conclusion.
C. Van Neil was the first to suggest that photosynthetic oxygen comes from water.
Photosynthesis releases oxygen as a by-product, but the actual source of this oxygen was a subject of scientific investigation.
Step 2: Contribution of C. Van Neil.
C. Van Neil studied photosynthetic bacteria and proposed that oxygen released during photosynthesis originates from water molecules, not from carbon dioxide.
Step 3: Supporting evidence.
Later experiments using isotopic oxygen confirmed Van Neil’s hypothesis.
Step 4: Conclusion.
C. Van Neil was the first to suggest that photosynthetic oxygen comes from water.
Was this answer helpful?
0
0
Top Questions on Respiration
- Volume of air remained in lungs even after forcible expiration:
- TS EAMCET - 2025
- Zoology
- Respiration
- Turbinals support this part of the nasal chamber
- TS EAMCET - 2025
- Zoology
- Respiration
- The following are the parts of alimentary canal of cockroach:
I. Colon,
II. Mesenteron,
III. Crop,
IV. Gizzard,
V. Ileum,
VI. Rectum,
VII. Oesophagus
Arrange them in the correct sequence- TS EAMCET - 2025
- Zoology
- Respiration
- Consider the following statements Assertion (A): Respiratory system of cockroach is polypneustic type. Reason (R): All spiracles are functional. The correct answer is
- TS EAMCET - 2025
- Zoology
- Respiration
- What is the \% of carbon dioxide in the inhaled and exhaled air?
- TS POLYCET - 2025
- Biology
- Respiration
View More Questions
Questions Asked in MHT CET exam
- What is the standard electrode potential of the half-reaction: \[ \text{Cu}^{2+} + 2e^- \rightarrow \text{Cu} \, (\text{solid})? \] Given that the standard electrode potential for the half-reaction: \[ \text{Ag}^+ + e^- \rightarrow \text{Ag} \, (\text{solid}) \quad \text{is} \, +0.80 \, \text{V}. \] Also, the cell potential for the following reaction is: \[ \text{Cu}^{2+} + 2\text{Ag} \rightarrow \text{Cu} + 2\text{Ag}^+ \] is \( 0.46 \, \text{V} \).
- MHT CET - 2025
- Electrochemistry
- A cylindrical pipe has a radius of \( 0.1 \, \text{m} \). If the speed of water flowing through the pipe is \( 2 \, \text{m/s} \), calculate the volume flow rate of water through the pipe.
- MHT CET - 2025
- mechanical properties of fluid
- A particle is moving with a constant velocity of 5 m/s in a circular path of radius 2 m. What is the centripetal acceleration of the particle?
- MHT CET - 2025
- centripetal acceleration
- A ball is thrown vertically upwards with an initial velocity of 20 m/s. Calculate the time it takes for the ball to reach the highest point. (Assume \( g = 9.8 \, \text{m/s}^2 \))
- MHT CET - 2025
- laws of motion
- A charge of 2 $\mu C$ is placed in an electric field of intensity \( 4 \times 10^3 \, \text{N/C} \). What is the force experienced by the charge?
- MHT CET - 2025
- Electric charges and fields
View More Questions