The human eye and brain together translate light into color. Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. ... Rather, the surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors thus, we have two types of photoreceptor cells, known as rods and cones. Cone cells deal in colour, while rod cells allow us to see in grayscale in low-light conditions, for example at night.
Answer: The color black is a not a reflection of colors, but an absorption, meaning that all the colors of the spectrum are absorbed by the object.
Explanation: "We see the color of an object because that object reflects “a color” to the eye. ... Black is not a color; a black object absorbs all the colors of the visible spectrum and reflects none of them to the eyes. The grey area about black: A black object may look black, but, technically, it may still be reflecting some light."
Photosynthesis is the process by which photosynthetic organisms transform light energy into chemical energy
Photosynthesis is an oxidative reductive metabolic pathway in which water is oxidized and carbon dioxide is reduced to carbohydrates
Light reaction of photosynthesis is concerned with light dependent oxidation of water and synthesis of high energy compounds such as ATP and NADPH
All proteins and cofactors which involves in light reaction are present in thylakoid membrane hence light reaction of photosynthesis completed in thylakoid membrane
Transfer of electron and protons in thylakoid membrane is carried out by four protein complexes and two mobile electron carriers
Oxidation of one water molecule generates two electrons, two protons and one atom of oxygen
Transfer of one electron from Photosystem II (PSII) to Photosystem I (PSI) requires one photon and transfer of one electron from PSI to NADP+ requires one photon, thus transfer of two electrons from PSII to NADP+ requires four photons
Flow of two electrons from cytochrome b6f complex drives transportation of four protons from stroma to lumen
Thus oxidation of one water molecule establish gradient of 6 H+, gradient of 6 H+ drives synthesis of 2 ATP
Reduction of 1 NADP+ to NADPH requires two electrons, thus oxidation of one eater molecule generates 1 NADPH
