Hello there! 
I am not really sure which part you are talking about but let me answer some of them. 
First, you need to read the information they gave you about glucose etc.. 
13- What is produced in photosynthesis? 
"Photosynthesis is essential for all life on earth, because it provides food and oxygen."
Thus, the answer is: Photosynthesis produced food and oxygen. 
14- What is the glucose used for? 
"The glucose produced is used by the plant for energy and growth." 
Thus, the answer is: The glucose used for energy and growth of the plants. 
15- What is the oxygen used for?
"The oxygen produced is released into the air for us to breath."
Thus, the answer is: The oxygen used for us to breath. 
I hope this helps! 
Let me know if you have questions about the answer.