Editor
When a plant was kept in darkness for many days its leaves turned yellow. Why? 
Difficulty: Easy
A: 

Leaves could not get oxygen and so there was no photosynthesis 

B: 

Leaves could not get light and so there was no respiration 

C: 

Leaves could not get oxygen and so there was no respiration 

D: 

Leaves could not get light and so there was no photosynthesis

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