You are presented with the quiz "When a plant grows , the size of _   of that plant may increase" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "when a plant grows , the size of the leaves of that plant may increase" and "leaves Are the primary photosynthetic organs of a plant". 

So, what's the best answer to the question?


 

    photosynthetic  organs       