Biology: The Dynamic Science
4th Edition
ISBN: 9781337246422
Author: Peter J. Russell; Paul E. Hertz; Beverly McMillan
Publisher: Cengage Learning US
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Chapter 8.4, Problem 2SB
Summary Introduction
To review:
The C4 pathway and the method through which this pathway circumvents photorespiration.
Introduction:
Photorespiration affects the rate of photosynthesis in plants. To minimize its effect, plants of the hot and arid region have developed special anatomy and a different pathway of photosynthesis called the C4 pathway. They possess a high number of chloroplasts in their cells.
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Under what environmental conditions does
photorespiration “outcompete" that of the CC?
Specifically, what mechanism is responsible for
committing the cell to photorespiration and what type
of plant does not have any "safeguards" to ensure that
the CC is performed rather than photorespiration?
A) The concentration of CO2 is lower inside a plant cell than in the atmosphere (outside the cell). In your own words, describe how the CO2 levels are kept low inside the plant cell and explain why this is necessary. Assume stomata are open.
B) Regarding the situation presented in Part A and assuming that the stomata of the plant leaves are closed, would this favour the induction of photorespiration in a C3 plant? Explain. Make reference to relevant molecule or molecules as needed.
Please clearly label your responses as A and B
What is the benefit of Photorespiration in plants and what problem does it pose in many plants?
Chapter 8 Solutions
Biology: The Dynamic Science
Ch. 8.1 - What are the two stages of photosynthesis?Ch. 8.1 - In which organelle does photosynthesis take place...Ch. 8.2 - What is the difference in function between the...Ch. 8.2 - Prob. 2SBCh. 8.2 - What is the difference between the linear electron...Ch. 8.3 - What is the reaction that rubisco catalyzes? Why...Ch. 8.3 - How many molecules of carbon dioxide must enter...Ch. 8.4 - Prob. 1SBCh. 8.4 - Prob. 2SBCh. 8.4 - How are carbon fixation and the Calvin cycle...
Ch. 8.5 - How are the reactants and products of...Ch. 8 - An organism exists for long periods by using only...Ch. 8 - Prob. 2TYKCh. 8 - Which of the following is a correct step in the...Ch. 8 - Prob. 4TYKCh. 8 - Prob. 5TYKCh. 8 - Which of the following statements about the C4...Ch. 8 - Prob. 7TYKCh. 8 - The oxygen released by photosynthesis comes from:...Ch. 8 - You bite into a spinach leaf. Which one of the...Ch. 8 - Animal metabolism and plant metabolism are related...Ch. 8 - Discuss Concepts Suppose a garden in your...Ch. 8 - Prob. 12TYKCh. 8 - Discuss Concepts Like other accessory pigments,...Ch. 8 - Prob. 14TYKCh. 8 - Prob. 15TYKCh. 8 - Prob. 16TYKCh. 8 - Photosynthesis directly opposes respiration in...Ch. 8 - Prob. 2ITDCh. 8 - Prob. 3ITDCh. 8 - Prob. 4ITD
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- What are some of the biological process in which photophosphorylation plays a critical role?arrow_forwardWhat Is the Molecular Architecture of PhotosyntheticReaction Centersarrow_forwardHow does the anatomical differences between C3 and c4 leaves facilitate photosynthesis 2) discuss the functional implications of the dominant pigment bandarrow_forward
- Give comparison between the following:(a) C3 and C4 pathways(b) Cyclic and non-cyclic photophosphorylation(c) Anatomy of leaf in C3 and C4 plantsarrow_forwardWhat effect would there be on C3 and C4 plants for increased oxygen levels? Why? Explain its effect in the mechanism of the pathway.arrow_forwardWhat is the advantage of the C4 photosynthetic pathway as compared to the conventional C3pathway? How might these advantages influence where these plant species are found?arrow_forward
- How, then, do plants that grow in hot climates ,such as sugar cane, prevent very high rates of wasteful photorespiration?arrow_forwardWhat enzyme fixes CO2 in bundle sheath cell of chloroplasts in Calvin Cycle of C4 plants?arrow_forwardWhat is the advantage to plants to have the option of both cyclic and noncyclic pathways for photophosphorylation?arrow_forward
- What is C2 cycle of photorespiration?arrow_forwardWhat is so special about thylakoid membranes (and chloroplasts in general) that allow it to be the site for photosynthetic activity in plants?arrow_forwardEven though C4 plants require more ATP per CO₂ fixed, at higher temperatures, they are more efficient than C3 plants. Which of the following explains the effectiveness of C4 plants? contains a mutant form of Rubisco that does not bind to oxygen oxygen is prevented from entering the bundle-sheath cells where Rubisco is found Oduring the night, carbon dioxide is stored as malate so that stomata do not need to open during the day O photorespiration in C4 plants produces energy while in C3 plants, energy is consumedarrow_forward
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