life on the earth would be impossible in the absence of photosynthesis." give reasons to support this statement.

Solution:

All heterotrophic organisms on earth depend directly or indirectly on food prepared by plants through photosynthesis. Also, photosynthesis maintains oxygen levels in the atmosphere. Thus, in absence of photosynthesis, the food and oxygen which are necessary for life on earth will not be available to living organisms. Hence, they will not be able to survive.
 

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