Which of the following is not true?

a. ATP is formed during both photosynthesis and cellular respiration.

b. both plants and animal cells carry out cellular respiration.

c. carbon dioxide is released during photosynthesis and used during cellular respiration.

d. oxygen is used during cellular respiration and released during photosynthesis

The answer is C.

It is not true that CO2 is released during photosynthesis, rather its the opposite. Carbon dioxide is a raw material for the production of starches and cellulose through photosynthesis. Atmospheric carbon dioxide is captured during the light dependent reactions of photosynthesis then used for the production of starch, glucose and cellulose in the light independent reactions (Calvin cycle) of photosynthesis.

In aerobic cellular respiration, oxygen rather than Carbon dioxide is a requirement because it is needed as the terminal electron acceptor in the production of ATP.