Question

Waste product of photosynthesis is:
A) Carbon dioxide
B) Oxygen
C) Nitrogen
D) None of the above

Answer 1

Hint:It is used by both plants and animals in the respiration process. This is also used as life support for the astronauts. This is one of the most important sources in everyone’s life.

Complete answer:
Excretion is defined as the removal of the waste products from the plants, animals and other living organisms. The waste products involve toxic materials, extra substance from the organisms etc. Plants needed to excrete carbon dioxide and oxygen. Carbon dioxide is the waste product involved in the aerobic respiration of the plants whereas oxygen is the waste product during the process called photosynthesis. Photosynthesis is the process by which the plants take up the light and that light is converted into the chemical energy to meet the requirements of food. During this process, green plants convert carbon dioxide, water and other minerals into the oxygen and other energy rich compounds. The food which is prepared is glucose. To form the glucose the reaction is carried out between six molecules of carbon dioxide and six molecules of water which forms a glucose and six molecules of oxygen. Then, this oxygen which formed during formation of glucose is treated as a waste product.
$$C{O}_2+H_{2}O\underset{Greenplants}{\overset{Sunlight}{\to }}{O}_2+Organicmatter$$

Thus, the correct answer is option B. i.e., Oxygen.

Note: The oxygen is produced because of the splitting of water molecules in the presence of light and this phenomenon is called photolysis. Glucose is the energy source for the plants that helps in growing flowers and fruits. Also, humans depend on the plants for their food because humans are heterotrophs and plants are autotrophs.