Answer :

A-Food molecules ; photosynthesis produces food molecules i.e. glucose.


B¾ Photosynthesis; Co2 is used in photosynthesis.


C¾ Respiration; Respiration releases CO2 so C is respiration


(b) The given cycle is oxygen cycle because atmospheric oxygen is taken up in C respiration to give out CO2 which is used in B photosynthesis to produce food i.e. A


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