The reason why the C 4 plant thrives but the C 3 plant sickens and eventually dies when both the plants are placed together in a sealed illuminated box. Concept introduction: Botanists use C 3 , C 4 , and CAM as a method to classify Earth’s plants into categories; this refers to the number of first carbon compounds to which the CO 2 is fixed. The majority of land plants use the C 3 pathway. In higher plants, certain respiratory processes take place where the plants’ uptake oxygen in the presence of sunlight and releases CO 2 into the atmosphere. This process is entirely different from the photosynthesis process.

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Chapter 19, Problem 43CQ

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To determine: The reason why the C₄ plant thrives but the C₃ plant sickens and eventually dies when both the plants are placed together in a sealed illuminated box.

Concept introduction: Botanists use C₃, C₄, and CAM as a method to classify Earth’s plants into categories; this refers to the number of first carbon compounds to which the CO₂ is fixed. The majority of land plants use the C₃ pathway. In higher plants, certain respiratory processes take place where the plants’ uptake oxygen in the presence of sunlight and releases CO₂ into the atmosphere. This process is entirely different from the photosynthesis process.

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