Both cytoplasm and mitochondria:

In cytoplasm, glycolysis process takes place but this process is common for both anaerobic(fermentation) and aerobic.The product of glycolysis process is pyruvic acid that you know and it transfer into mitochondrial matrix

Aerobic Respiration in Plants

Aerobic respiration is the process by which plants and other organisms convert organic compounds, such as glucose, into carbon dioxide, water, and energy in the presence of oxygen. This process occurs in the mitochondria of plant cells and is the primary means by which plants generate energy.

Site of Aerobic Respiration
The site of aerobic respiration in plants is primarily the mitochondria, which are known as the "powerhouses" of the cell. Mitochondria are double-membrane organelles that are found in the cytoplasm of eukaryotic cells, including plant cells.

Process of Aerobic Respiration in Plants
Aerobic respiration in plants can be divided into three main stages: glycolysis, Krebs cycle (also known as the citric acid cycle), and oxidative phosphorylation (electron transport chain).

1. Glycolysis: The process of aerobic respiration begins with glycolysis, which occurs in the cytoplasm of the cell. During glycolysis, glucose is broken down into two molecules of pyruvate. This process does not require oxygen and generates a small amount of ATP.

2. Krebs Cycle: The pyruvate molecules produced during glycolysis are then transported into the mitochondria. In the mitochondria, the pyruvate is further broken down in a series of reactions known as the Krebs cycle. During the Krebs cycle, carbon dioxide is released, and energy-rich molecules such as NADH and FADH2 are produced.

3. Oxidative Phosphorylation: The final stage of aerobic respiration is oxidative phosphorylation, which occurs in the inner mitochondrial membrane. During this stage, the energy-rich molecules (NADH and FADH2) produced in the Krebs cycle donate electrons to the electron transport chain. As the electrons pass through the electron transport chain, energy is released and used to generate ATP through a process called chemiosmosis. Oxygen is the final electron acceptor in this process, and water is produced as a byproduct.

Importance of Aerobic Respiration in Plants
Aerobic respiration is essential for plants as it provides them with the energy they need to carry out various physiological processes, such as growth, reproduction, and defense against pathogens. It also helps in the synthesis of various biomolecules required for plant growth and development. Additionally, aerobic respiration plays a crucial role in carbon dioxide fixation and oxygen release, which are essential for maintaining the balance of gases in the atmosphere.

In conclusion, aerobic respiration in plants occurs primarily in the mitochondria. It involves three main stages: glycolysis, Krebs cycle, and oxidative phosphorylation. This process is vital for providing plants with the energy they need for growth and other physiological functions.