AP BIOLOGY

Detailed explanation-1: -Light-dependent reactions happen in the thylakoid membrane of the chloroplasts and occur in the presence of sunlight. The sunlight is converted to chemical energy during these reactions. The chlorophyll in the plants absorb sunlight and transfers to the photosystem which are responsible for photosynthesis.

Detailed explanation-2: -In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts. Photosystems, large complexes of proteins and pigments (light-absorbing molecules) that are optimized to harvest light, play a key role in the light reactions.

Detailed explanation-3: -the thylakoid membrane, embedded in the stroma, encloses the aqueous lumen, which is the innermost compartment of the chloroplast.

Detailed explanation-4: -The light reaction is also known as photolysis reaction and takes place in the presence of light. It usually takes place in the grana of chloroplasts. The photosystems have pigment molecules.

Detailed explanation-5: -(i) Light reactions occur in grana thylakoids whereas dark reactions occur in stroma of chloroplasts.