AP BIOLOGY

Detailed explanation-1: -There are two types of photosystems in the light-dependent reactions, photosystem II (PSII) and photosystem I (PSI).

Detailed explanation-2: -Harnessing light and splitting water occurs in both photosystem I and II.

Detailed explanation-3: -In light-dependent reactions, the energy from sunlight is absorbed by chlorophyll and converted into chemical energy in the form of electron carrier molecules like ATP and NADPH. Light energy is harnessed in Photosystems I and II, both of which are present in the thylakoid membranes of chloroplasts.

Detailed explanation-4: -In the light-dependent reactions, energy absorbed by sunlight is stored by two types of energy-carrier molecules: ATP and NADPH. The energy that these molecules carry is stored in a bond that holds a single atom to the molecule.