Question

How can we say that photosynthesis is the basic energy source for the living world?

Answer 1

Hint: All living organisms either plants or animals, unicellular or multicellular constantly need energy to live. They get energy by eating foods. The energy obtained from food is directly or indirectly received from the plants by the process called photosynthesis.

Complete answer:
The process, by which green plants make their own food (like glucose) from carbon dioxide and water by using sunlight energy in the presence of chlorophyll, is called photosynthesis.
Animals and plants synthesize fats and proteins from carbohydrates, so glucose is considered the basic energy supply for all living organisms.
The oxygen free (with vapor in the process transpiration) as a photosynthesis byproduct, mostly phytoplankton produces oxygen as a respiration in plants and animals, and animals convert it into carbon dioxide necessary for the process of photosynthesis.
Importance of photosynthesis:
-Synthesis of organic food by using inorganic components along with water and sunlight.
-Heterotrophic organisms depend upon plants for organic food because they aren't able to make food by itself like plants.
-It can convert solar energy or we can say radiant energy into chemical energy.
-All plant products are formed from photosynthetic activity, e.g. oils, resins, fibers, drugs, rubber.
-It absorbs carbon dioxide from the atmosphere which tends to increase due to respiration of organisms and combustion.
-It releases oxygen which is consumed in respiration and combustion.
-It is the basic source of oxygen in the atmosphere.
-It maintains the carbon cycle in between the earth, ocean, animals and plants.
-It is responsible for symbiotic relationships between plants, animals and human beings.
-Photosynthesis is important for autotrophic nutrition and provides foods to heterotrophs. Plays an important role in the food chain and hence we can say that photosynthesis is the basic energy source for all living organisms present on earth.

Note:
Photosynthesis is the basic source of energy as plants can make food by using inorganic materials with the help of water and sunlight. They provide food to other animals that cannot make their own food by the process called photosynthesis. And hence they store foods in the form of carbohydrates. If this process would stop, the entire food chain would be affected completely because all organisms depend directly or indirectly on the plant and plant products that depend on photosynthesis.