Question

The gaseous byproduct of a process in plants is essential for another vital process that releases energy. Given below are four combinations of processes and products. Choose the correct combination.

• A. Photosynthesis and oxygen
• B. Respiration and carbon dioxide
• C. Transpiration and water vapour
• D. Germination and carbon dioxide

Answer 1

The correct option is A Photosynthesis and oxygen

Photosynthesis and respiration are the two vital processes occurring in the plants. In the given question the two processes that has been discussed are photosynthesis are respiration. During photosynthesis, carbon dioxide is fixed to form glucose and oxygen is released.

Photosynthesis chemical equation:

6CO${}_2$→12H${}_2$O→C${}_6$H${}_{12}$O${}_6$+6H${}_2$O+6O${}_2$↑

The oxygen from this reaction is fixed for respiration and glucose is broken down for the release of energy.

Respiration chemical equation:

C${}_6$H${}_{12}$O${}_6$+6O${}_2$→6CO${}_2$+6H${}_2$O+Energy↑

Oxygen released during photosynthesis will be used in respiration.

Thus, the correct answer is 'Photosynthesis and oxygen'.