The equations represent two biochemical processes that occur in living organisms. The letter X represents a molecule produced from Process 1.
Process 1: oxygen + glucose → carbon dioxide + water + X
Process 2: carbon dioxide + water + X → oxygen + glucose

Q1. Which process occurs in the cells of a green plant leaf?
(1) Process 1, only
(2) Process 2, only
(3) Neither process 1 nor process 2
(4) Both process 1 and process 2

Q2. Which process occurs in the cells of an animal?
(1) Process 1, only
(2) Process 2, only
(3) Neither process 1 nor process 2
(4) Both process 1 and process 2