Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 34, Problem 14TYK
Summary Introduction

To review:

The experimental design to determine the photosynthetic strategy followed by the new species of succulent plant, which has stomata open during the daytime under the mild spring environment.

Introduction:

The process of photosynthesis is categorized on the basis of external environmental conditions into different types. C3, C4 and CAM photosynthetic pathways are the modes followed by the plants to make sugars from CO2. Crassulacean acid metabolism (CAM) is a carbon fixation mechanism mainly evolved in plants of dry and arid conditions. The main feature of these plants is the opening of stomata at night to collect carbon dioxide. The closed state of stomata during daytime prevents the loss of water, thus helps the plant to prevent from desiccation.

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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
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About 200 years ago, Jan Baptista van Helmont wanted to know where growing plants get the materials necessary for increases in size. He planted a tree seedling weighing 2.2 kilograms (5 pounds) in a barrel filled with 90 kilograms (200 pounds) of soil and then watered the tree regularly. After five years, the tree had gained almost 75 kilograms (164 pounds), and the soil's weight was unchanged. He incorrectly concluded that the tree had gained all of its additional weight by absorbing water. How did the tree really gain most of its weight?
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