AP BIOLOGY

Detailed explanation-1: -Photosystem I (PS I) and II (PS II) are found in the thylakoid membranes inside the chloroplast. The photosystems are responsible for carrying out photochemical phase or light reaction of photosynthesis.

Detailed explanation-2: -Within chloroplasts, photosystems I and II carry out the initial steps in photosynthesis by harvesting light energy and converting it to chemical energy. These photosystems are composed of protein subunits, chlorophyll, and cofactors.

Detailed explanation-3: -Physically, photosystems are found in the thylakoid membranes. There are two kinds of photosystems: photosystem I (PSI) and photosystem II (PSII) (Fig. 3.3).

Detailed explanation-4: -Photosystems are found in the thylakoid membranes of plants, algae, and cyanobacteria. These membranes are located inside the chloroplasts of plants and algae, and in the cytoplasmic membrane of photosynthetic bacteria. There are two kinds of photosystems: PSI and PSII.

Detailed explanation-5: -Chloroplasts are plastids which are responsible for photosynthesis. They are double-membraned, have their own genetic material and contain the green pigment chlorophyll. The mitochondrion is the major site for ATP synthesis and leucoplasts are plastids which are responsible for the storage of fat.