The two basic molecular systems for converting light to chemical energy during photosynthesis are called

Explanation

The correct answer is Photosystem I and II. These are the primary molecular systems in plants, algae, and cyanobacteria that convert light energy into chemical energy during photosynthesis. Photosystem II absorbs light, leading to the splitting of water molecules and the release of oxygen, while Photosystem I facilitates the formation of NADPH. Other options, such as 'Light systems' and 'PS 660 and PS 730,' do not exist in the scientific context of photosynthesis. 'Pigment systems' involve the absorption of light energy but do not directly convert it into chemical energy; this conversion is accomplished by the photosystems.