Biology · Respiration in Plants · NEET
No. Breathing is only the exchange of gases (taking in O2, giving out CO2). Cellular respiration is the chemical process inside the cell that breaks glucose to release energy as ATP. Plants have no lungs, so they do not breathe like us, but every plant cell still does cellular respiration.
No. Plants respire 24 hours a day, in every living cell, day and night. It only looks like night respiration is special because at night there is no photosynthesis to hide the CO2 released. During the day, photosynthesis uses up that CO2, so respiration is masked but still going on.
It starts in the cytoplasm (glycolysis, which splits glucose into pyruvate) and is completed inside the mitochondria (link reaction, Krebs cycle and the electron transport system). NCERT says the breakdown of complex molecules to yield energy takes place in the cytoplasm and in the mitochondria.
All living organisms respire, including plants, fungi and bacteria. Plants make their own glucose by photosynthesis, but non-green cells (roots, stems, seeds) cannot photosynthesise, so glucose is moved to them and every cell oxidises it by respiration to get ATP.
No. Respiration does not need light at all. Only photosynthesis needs light. This is why respiration continues in the dark, in roots underground, and inside germinating seeds where there is no light.
Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?
Try the real previous-year questions from this chapter — each with the answer and a full solution.
It is the process by which plant cells break down glucose step by step to release energy, which is stored as ATP for use in growth, transport and other life activities.
Photosynthesis only stores energy in glucose. To actually USE that energy for cell work, plants must break glucose down by respiration to release it as ATP. Also, non-green parts like roots and seeds cannot photosynthesise, so they depend fully on respiration.
The useful product is ATP, the energy currency of the cell. Aerobic respiration of glucose also releases carbon dioxide and water as by-products.
Usually aerobic (it uses oxygen and is completed in the mitochondria). But some plant cells and microbes can respire anaerobically (fermentation) when oxygen is not available, releasing far less energy.
Glycolysis, the first stage, happens in the cytoplasm and does not need oxygen. It splits one glucose into two pyruvate molecules and makes a small amount of ATP.
