Takes place in cytoplasm and mitochondria in eukaryotes and plasma membrane in prokaryotes
Takes place in the cytoplasm
More energy is liberated. One molecule of glucose releases 6 73 kcal energy
Less energy is liberated. One molecule of glucose releases 21 kcal energy
Food is completely oxidized
Food is incompletely oxidized.
Coenzyme is a complex non-protein molecule which is temporarily bound to an enzyme and acts as a link between metabolic pathways, (series of biochemical reactions).
In plants, the atmospheric air moves in and out by simple diffusion that takes place through; the general body surface of the plant (stems, roots, fruits and seeds), lenticels (openings in the bark of the tree trunk) and stomata are openings generally present on the lower surface of the leaves through which the gases and water vapour diffuse in and out easily.
Plants do not need O2 carrier (in contrast to animals where O2 is carried by blood) because O2 requirement is less in plants than in animals because the plants have a large surface area (leaves) to absorb the required amount of O2 through diffusion.
Gases through the atmosphere enter the intercellular spaces inside the plants. More O2 utilized and more it diffuses into the plant. CO2 is being continuously formed and its concentration in tissue spaces becomes higher than in the surrounding air. So, it diffuses out of the plant, especially when it is not being used for photosynthesis.
During the day the rate of photosynthesis is usually much higher than the rate of respiration so plants absorb most of the carbon dioxide they need from the air by diffusion. The amount of oxygen produced is far greater than the amount needed for respiration of the cells, so it builds up inside the leaf and diffuses out in the air through the stomata. At night no photosynthesis takes place so the leaf absorbs the oxygen it requires from the atmosphere. Animals gives out CO2 at all times.