Ans. Produced by chloroplasts.
Plants are autotrophic organisms that make their own food from inorganic substances, in the presence of sunlight. This process is known as photosynthesis during which, carbon dioxide and water makes glucose and oxygen releases as byproduct.
In higher plants, photosynthesis takes place in chloroplasts as chlorophyll molecules present in chloroplast trap sun's energy, which is used by plants to make food.
Thus, the correct word to be filled in the blank is 'produced by chloroplasts.'