The correct answer is : C. 1 - oxygen ; 2 - carbon dioxide.
Explanation:
The given picture shows the occurrence of photosynthesis and cellular respiration in the plant and animal, respectively. Both the processes form a part of the Carbon Cycle.
During photosynthesis, the plant utilises the carbon dioxide, obtained from the air, and water, obtained from the soil, along with light energy, to produce its metabolic product, glucose and by-product, oxygen.
During cellular respiration, the animal utilises the oxygen released by the plants for oxidising its food and obtaining energy and release carbon dioxide as by-product which is again taken up by the plants for photosynthesis.
This is the way by the carbon cycles in the biosphere.
