Match the Column I with Column II : 

a-4 ,b-3 ,c-2 ,d-1 

The correct answer is Option (4)- a-4 ,b-3 ,c-2 ,d-1

Light reactions or the ‘Photochemical’ phase include light absorption, water splitting, oxygen release, and the formation of high-energy chemical intermediates, ATP and NADPH.  In photosystem II the reaction centre chlorophyll a absorbs 680 nm wavelength of red light causing electrons to become excited and jump into an orbit farther from the atomic nucleus. These electrons are picked up by an electron acceptor which passes them to an electrons transport system consisting of cytochromes . The electrons that were moved from photosystem II must be replaced. This is achieved by electrons available due to splitting of water. The splitting of water is associated with the PS II; water is split into 2H⁺ , [O] and electrons. This creates oxygen, one of the net products of photosynthesis.

C4 plants are special. They have a special type of leaf anatomy, they tolerate higher temperatures, they show a response to high light intensities, they lack a process called photorespiration and have greater productivity of biomass.

The particularly large cells around the vascular bundles of the C4 plants are called bundle sheath cells, and the leaves which have such anatomy are said to have ‘Kranz’ anatomy.

Four primary pigments of green plants can easily be separated and identified using a technique called paper chromatography. These pigments include two greenish pigments called chlorophylls and two yellowish pigments called carotenoids. Pigments are separated according to differences in their relative solubilities.

Ribulose bisphosphate Carboxylase-Oxygenase or RuBisCO is the most abundant protein in the biosphere. It catalyses the first step of carbon fixation in the Calvin cycle during photosynthesis. It is the common pathway of carbon fixation in all plants, i.e. C3, C4 and CAM plants.