What is the cellular process in which stored food reserves are converted into usable energy for the plant?

What is the cellular process in which stored food reserves are converted into usable energy for the plant?

• A. Respiration
• B. Transpiration
• C. Photosynthesis
• D. Glycolysis

Answer: (A)

The main concept here is cellular respiration. This is the process by which stored chemical energy in food reserves—like starch or other organic molecules in plants—is broken down to produce ATP, the energy currency the cell uses. In plants, respiration starts with glycolysis in the cytosol, which yields a small amount of ATP and pyruvate. The pyruvate then enters mitochondria for the TCA cycle and oxidative phosphorylation, where most of the ATP is generated. This whole pathway provides the energy plants need for growth, maintenance, and activities, regardless of light. Transpiration involves water loss and does not produce usable energy. Photosynthesis captures light energy to build sugars, storing energy rather than releasing it as ATP. Glycolysis is part of respiration, the initial step, but the complete process of converting stored reserves into usable energy is respiration.

The main concept here is cellular respiration. This is the process by which stored chemical energy in food reserves—like starch or other organic molecules in plants—is broken down to produce ATP, the energy currency the cell uses. In plants, respiration starts with glycolysis in the cytosol, which yields a small amount of ATP and pyruvate. The pyruvate then enters mitochondria for the TCA cycle and oxidative phosphorylation, where most of the ATP is generated. This whole pathway provides the energy plants need for growth, maintenance, and activities, regardless of light.

Transpiration involves water loss and does not produce usable energy. Photosynthesis captures light energy to build sugars, storing energy rather than releasing it as ATP. Glycolysis is part of respiration, the initial step, but the complete process of converting stored reserves into usable energy is respiration.