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Question: In C\(_3\) plants, the first stable product of photosynthesis during the dark reaction is A. 3-ph...

In C3_3 plants, the first stable product of photosynthesis during the dark reaction is
A. 3-phosphoglyceric acid
B. Phosphoglyceraldehyde
C. Malic acid
D. Ocalocaetic acid

Explanation

Solution

Plant performs photosynthesis in two different phases such as the light-dependent reaction phase and light-independent reaction phase. In both phases different reaction enzymes are used and for the different cycle.

Complete answer: Plants have categorized into different photosynthetic cycle formation that name as C3_3 cycle (Calvin cycle), C4_4 cycle, and CAM cycle which occurs in different plant groups. C3_3 cycle occurs in every plant, either plant is C4_4 or C3_3 cycle categorized.
C3_3 cycle is light-independent photosynthesis and active when NADPH and ATP are abundant. The ATP provided by cyclic and non-cyclic photophosphorylation, which process the endergonic reaction. It is a three-step process named carbon fixation, reduction, and then regeneration. In the C3_3 cycle, the first stable carbon compound formed during the reaction is 3-phosphoglyceric acid, which is a 3-carbon compound, which is called the C3_3 pathway. C4_4 the cycle occurs in many kinds of grass, monocot, and dicot plants, it is also a carbon fixation process, in this first stable carbon compound is formed is called oxaloacetic acid (OAA), which is a four-carbon compound. This cycle initiates with phosphoenolpyruvate (PEP), which is a 3-carbon compound. Malic acid is the organic compound that provides a sour taste and it is an intermediate product used in the C4_4 cycle which is converted into pyruvic acid by reacting with NADP+. Phosphoglyceraldehyde is the carbon compound that is formed during the anaerobic metabolism of carbohydrates by breaking diphosphate fructose.
Hence the correct option is A.

Note: Apart from C3_3 and C4_4 cycle, CAM cycle also found in some plant that is called xerophytes or desert plants. CAM is called Crassulacean acid metabolism, which performs double fixation of carbon dioxide. Normally CAM plants perform C3_3 plants but under stress, condition the plant performs the CAM process.