NEET Biology Chapter 14

Respiration in Plants

All Living organisms need energy for carrying out daily life activities, be it absorption, transport, movement, reproduction, or even breathing. Where does all this energy come from?

We know we eat food for energy but how is this energy taken from? How is this energy utilised?

Do all foods give the same amount of energy ? Do Plants eat? Where do plants get their energy from? And micro organisms for their requirements do they eat food?

All the energy required for life processes is obtained by oxidation of some macromolecules that we call 'food' Only green plants and cyanobacteria can prepare their own food, by the process of photosynthesis they trap light energy and convert it into chemical energy that is stored in the bonds of carbohydrates like glucose, sucrose, and starch. We must remember that in green plants too, not all cells containing chloroplasts, that are most often located in the superficial layers, carry out photosynthesis. Hence, even in green plants all other organs, tissues and cells that are non green, need food for oxidation. Hence, food has to be translocated to all non green plants.\

Animals are heterotrophic i.e... they obtain food from plants directly (herbivores) or indirectly (carnivores). Saprophytes like fungi are dependent on dead and decaying matter. What is important to recognise is that ultimately all the food that is respired for life processes come from photosynthesis.

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