Compare CAM plants and C_3 plants.


Compare {eq}\rm CAM{/eq} plants and {eq}\rm C_3{/eq} plants.


Photosynthesis is a process in which carbohydrates are produced from carbon dioxide and water, in the presence of sunlight, by the green plants containing chlorophyll pigment (and blue-green algae/cyanobacteria). There are three pathways in which thee photosynthesis occurs, i.e., C{eq}_3{/eq} pathway, CAM pathway, and C{eq}_4{/eq} pathways. They are classified on the basis of the first product formed in the process of carbon dioxide fixation.

Answer and Explanation:

The comparison between the C{eq}_3{/eq} plants and CAM plants can be done on the basis of the following points:

  • C{eq}_3{/eq} plants form a 3-carbon product (3-phosphoglyceric acid) in the process of assimilating the carbon during photosynthesis while CAM plants store energy from sunlight and utilize it during the night to form crassulacean acid, thus the name crassulacean acid metabolism (CAM).
  • Both C{eq}_3{/eq} and CAM plants perform photosynthesis in the mesophyll cells.
  • Examples of C{eq}_3{/eq} plants are sunflower, spinach, beans, rice, and cotton. Examples of CAM plants are cacti and orchids.
  • C{eq}_3{/eq} plants are very common while CAM plants are found in semi-arid conditions (except orchids which are found more in tropical rainforest conditions).
  • C{eq}_3{/eq} plants fall in the category of mesophytic, hydrophytic, and xerophytic while CAM plants are only xerophytic in nature.
  • C{eq}_3{/eq} plants utilize 12 NADPH and 18 ATPs for the production of glucose while CAM plants utilize 12 NADPH and 39 ATPs for the production of glucose.
  • First stable product in C{eq}_3{/eq} plants is 3-phosphoglycerate while the first stable product of CAM plants is oxaloacetate at night and 3-phosphoglycerate during the day.
  • C{eq}_3{/eq} plants function best at a temperature of 15-25 degrees Celsius while optimum temperature for CAM plants is more than 40 degrees Celsius.

Learn more about this topic:

C3 Plants: Definition, Types & Examples


Chapter 17 / Lesson 14

Plants have evolved specific adaptations to allow them to survive in harsh climates. One of these adaptations is the way in which the plant undergoes photosynthesis. This lesson will focus on C3 plants, which use the most basic type of photosynthesis.

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