Energy Sources and Food Translocation — NEET Biology
📚 Practice ConceptAll the energy required for 'life' processes is obtained by oxidation of some macromolecules that we call 'food'. 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, tissues and organs photosynthesise; only 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 parts. Animals are heterotrophic, i.e., they obtain food from plants
Consider the following statements: 1. All energy required for life processes is obtained by oxidation of macromolecules termed as food. 2. In green plants, all cells and tissues including non-green parts are capable of photosynthesis. 3. The breaking of C–C bonds of complex compounds through oxidation within cells to release energy is called respiration. 4. ATP acts as the energy currency of the cell since energy released during respiration is trapped in it. 5. Proteins, fats, and even organic acids can serve as respiratory substrates in some plants under certain conditions. Choose the correct option:
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