Final answer:
In photosynthesis, radiant energy from sunlight is absorbed by chloroplasts and used to convert carbon dioxide and water into glucose and oxygen.
Step-by-step explanation:
The process of photosynthesis can be represented by the model: a) radiant energy -> chloroplast -> CO₂ + H₂O -> sugar + O₂. In this model, radiant energy (sunlight) is absorbed by chloroplasts, where it is used to convert carbon dioxide (CO₂) and water (H₂O) into glucose (sugar) and oxygen (O₂) through a series of chemical reactions.