Answer: The plants get energy by the help of the process known as photosynthesis.
At night the plants rely on the process of glycolysis and mitochondrial respiration to generate the ATP for the cellular processes.
The process of glycolysis can be defined as the the breakdown of carbohydrates into pyruvate and the release of ATP for the cellular process.
The mitochondrial reactions can be defined as the set of metabolic reactions to convert energy stored in the macronutrients to ATP.
This is how the eukaryotic plants get sufficient amount of energy at night.
