Explain me the correct answer with reason please contact I have confusion between 1 and 3.According to answer key it should be 1.

Hello shaily
See the answer cannot pyruvic acid because the pyruvic acid which is formed is converted into the acetyl CoA in the motichondrial matrix and this Acetyl CoA is responsible for each and every cycle in plants for example in tricarboxylic acid cycle the acetyl CoA is the one is responsible for converting into OAA and Citric ACID and finally the succinic acid
And also you see fats,carbohydrates,protiens everything have to form Acetyl CoA which then enters into the krebs cycle directly pyruvic acid cant enter krebs cycle as it directly cannot form CO2 and water.

But in question it is every type of respiration i.e aerobic and anaerobic.And both types of respiration proceed after glycolysis having pyruvic acid as end product.n in anaerobic respiration it is directly used.So accordingly it should be pyruvic acid.Tell me if I am wrong