DENDROLOGY

Detailed explanation-1: -Photosystem I and photosystem II are the two multi-protein complexes that contain the pigments necessary to harvest photons and use light energy to catalyse the primary photosynthetic endergonic reactions producing high energy compounds.

Detailed explanation-2: -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-3: -The proteins involved in the light reactions of photosynthesis in plants are organized into five complexes in the thylakoid membrane (Figure 10.22). Two of these complexes are photosystems (photosystems I and II), in which light is absorbed and transferred to reaction center chlorophylls.

Detailed explanation-4: -In (a) photosystem II, the electron comes from the splitting of water, which releases oxygen as a waste product. In (b) photosystem I, the electron comes from the chloroplast electron transport chain. The two photosystems absorb light energy through proteins containing pigments, such as chlorophyll.