Concept explainers
Suppose an experiment is performed in which plant I is supplied with normal carbon dioxide but with water that contains radioactive oxygen atoms. Plant II is supplied with normal water but with carbon dioxide that contains radioactive oxygen atoms. Each plant is allowed to perform photosynthesis, and the oxygen gas and sugars produced are tested for radioactivity. Which plant would you expect to produce radioactive sugars, and which plant would you expect to produce radioactive oxygen gas? Explain why.
To describe:
Among the two types of plants whether plant I (grown with normal carbon dioxide and water containing radioactive oxygen) or plant II (grown with normal water and carbon dioxide containing radioactive oxygen) will produce radioactive sugars and whether plant I or plant II will produce radioactive oxygen gas.
Introduction:
The photosynthesis can be defined as the process through which the plants or the autotrophs produce food using the carbon dioxide, water, and sunlight. The photosynthesis inside the chloroplast takes place in two different stages, light reactions and carbon reactions or dark reactions.
Explanation of Solution
In an experiment Plant I is grown in normal carbon dioxide but with water containing radioactive oxygen atoms and plant, II is grown in radioactive oxygen in carbon dioxide and with normal water.
As the oxygen is released from photolysis of water which takes place during the photosynthesis, plant I will release oxygen-containing radioactivity. Photolysis can be defined as the splitting of the water molecule by the enzymes which are present in photosystem II. Photolysis facilitates the continuous supply of electrons to photosystem II. The overall reaction of photolysis can be shown as below:
Where,
The sugars are formed in the dark reactions or carbon reactions. During this phase, the plants absorb carbon dioxide which combined with
Where,
Since, the oxygen is released from the photolysis of water molecule, the plant I (grown with normal carbon dioxide and water containing radioactive oxygen) will produce radioactive oxygen. The sugars are formed from the combining of carbon dioxide with
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Chapter 7 Solutions
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- Why is it necessary for cells to have a vacuole filled with water if they are photosynthetic cells? Plant cells that do no do photosynthesis, might store starch or pigments in their vacuoles. So, why is a reservoir of water essential for cells doing photosynthesis? In your answer, be sure to refer to the organelle that does photosynthesis.arrow_forwardThe different parts of the chloroplast have separate reactions that occur in them. Which occurs in the stroma? A. Photolysis B. Light-dependent reaction C. Electron transport chain D. Calvin cyclearrow_forwardThere are two photosystems involved in the light reaction of photosynthesis. Both take upenergy from the sun in the form of light.A. Where are the photosystems located and what is the name of the organelle? B. Where does the energy that the photosystems take up, go? Describe for eachphotosystem WHERE the energy ends up at the end of the light reactions. In otherwords, what products contain the energy from which photosystem at the end ofthe light reaction?arrow_forward
- If you landed on a planet where all of the plants had purple leaves, what wavelengths of light would you expect to be least effective for photosynthesis? explain your reasoning.arrow_forwardMatch the step or structure in which each happens during Photosynthesis: A. Step where the water is split ? Goup choose : Light Dependant - Chlorphyll - Chloroplast - Precursor to Glucose -Calvin Cycle - Oxygen B. Result of splitting water that doesn’t move to next step? Goup choose : Light Dependant - Chlorphyll - Chloroplast - Precursor to Glucose -Calvin Cycle - Oxygen C. Organelle where Photosynthesis occurs? Goup choose : Light Dependant - Chlorphyll - Chloroplast - Precursor to Glucose -Calvin Cycle - Oxygen D. Site of sunlight absorption that excites electrons ? Goup choose : Light Dependant - Chlorphyll - Chloroplast - Precursor to Glucose -Calvin Cycle - Oxygen E. Step where Carbon Dioxide is pulled together ? Goup choose : Light Dependant - Chlorphyll - Chloroplast - Precursor to Glucose -Calvin Cycle - Oxygen F. Product of Carbon Dioxide being pulled together? Goup choose : Light…arrow_forward• Photosystems are used in which phase of photosynthesis?• Which of the following molecules is produced during the photosynthesis phase?arrow_forward
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