EBK BIOLOGY
5th Edition
ISBN: 8220100667978
Author: Maier
Publisher: PEARSON
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Textbook Question
Chapter 25, Problem 2LTB
How do the C4 and CAM adaptations to photosynthesis reduce water loss from plants?
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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
How do CAM plants, such as cacti, prevent excessive water loss in desert climates? How does this affect their photosynthetic process?
Plants have evolved by developing mechanisms that promote entry of CO, into the Calvin Cycle (CC) to limit
photorespiration when environmental conditions tend to favor the latter. This is because photorespiration 1) is
energetically inefficient (consuming more ATP than the CC alone) and 2) it does not produce any sugars that
can be "fed" into cellular respiration to produce lots more ATP.
A) 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?
B) Describe the mechanisms employed by two types of plants to minimize photorespiration and ensure that the
CC is carried out even when environmental conditions are not in their favor. Be sure to identify 1) the type of
plant, 2) its natural environment and how it affects the plant's ability to perform the CC,…
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Explain how C4 and CAM plants minimize photorespiration.arrow_forwardGive comparison between the following:(a) C3 and C4 pathways(b) Cyclic and non-cyclic photophosphorylation(c) Anatomy of leaf in C3 and C4 plantsarrow_forwardWhich of the following is TRUE about CAM photosynthetic pathway? Compared to the C3 and C4 pathways, CAM photosynthesis results in greater transpiration and water loss. O By separating where carbon is initially fixed inside the leaf tissue, CAM plants can better control the gradient of carbon dioxide between the air and their leaves. CAM photosynthesis is more energy efficient than C3 photosynthesis. Compared to C3 and C4 photosynthetic pathways, the rate of CAM photosynthesis is limited.arrow_forward
- What 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_forwardWhat is the overall outcome of the light reactions in photosynthesis? NADPH and ATP molecules are produced during the light reactions and are used to power the light independent reactions. NADPH and ATP molecules are produced during the light reactions, which are used to power the light dependent reactions. Sugar and ATP are produced during the light reactions, which are used to power the light independent reactions. Carbon dioxide and NADPH are produced during the light reactions, which are used to power the light dependent reactions.arrow_forwardHow does photosynthesis work in C4 and CAM plants?arrow_forward
- A group of scientists wants to test the effect of different wavelengths of light on plant photosynthesis. They have 3 treatment groups: red light, green light, and no light. They choose red light because chlorophyll has been shown to absorb red light. They choose green light because chlorophyll has been shown to reflect green light. They choose no light as a negative control to examine the rate of photosynthesis in the absence of light. To measure photosynthetic rate, the scientists use sensors to measure oxygen production of plants exposed to the different light treatments. Choose the best scientific hypothesis: O Photosynthesis is a critical process for plants, and it is of great importance that we understand how it is impacted by different wavelengths of light. O If rate of oxygen production is higher under red light than it is under green light or no light, it proves that red light has the largest effect on photosynthesis. O Because chlorophyll absorbs red light, rate of oxygen…arrow_forwardWhat special adaptation has evolved in CAM plants such as cacti and stonecrops that allows CO2 fixation and the Calvin cycle to occur in the same cell, but still occur separately? Briefly describe how this separation of events works.arrow_forwardWhat are the various sources of protons that contribute to the generation of a proton gradient in chloroplasts?arrow_forward
- You continuously monitor the photosynthetic oxygen production from the leaf of a plant illuminated by white light. How and why would oxygen production change if you placed filters in front of the light source that transmit (a) only red, (b) only infrared, and (c) only green light onto the leaf?arrow_forwardThe lab exploration we just completed looked at the process of Response area in a Response area and Response area in a Response area. The first task was to show that plants need photosynthesis to perform photosynthesis. This is captured by a pigment called Response area , which is found in the chloroplasts of a plant cell. In order for the plant to perform photosynthesis, it also needed Response area and Response area. The water entered the plant through thearrow_forwardHow does photosystem I reduce NADP+ ?arrow_forward
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Photosynthesis & Respiration | Reactions | Chemistry | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=3XIyweZg6Sw;License: Standard YouTube License, CC-BY