Cornelius van Niel Experiment

Q. The early suggestion that oxygen liberated by plants during photosynthesis comes from water was

1. proposed by van Niel
2. confirmed by the use of heavy water
3. made after the discovery of photorespiration because of Rubisco's sensitivity to oxygen
4. Was proposed by van Niel and later confirmed by experiments using heavy water

Q. Potassium Hydroxide is used in this experiment because

1. It is a chemical that releases Carbon Dioxide
2. It is a chemical that absorbs Oxygen
3. It is a chemical that absorbs Carbon Dioxide
4. Both B & C

Q. Who, among the following discovered that the oxygen is evolved from water during photosynthesis

1. R. Mayer
2. Ruben
3. Blackman
4. Calvin

Q. Which helped in confirming that oxygen evolved in photosynthesis comes from water

1. $H_2^{18}O$
   
2. ${}^{14}C{O}_2$
   
3. ${}^{15}N{O}_3$
   
4. ${}^3{H}_{2}O$