Question

In pigment system 2, active chlorophyll is
A. ${P_{680}}$
B. ${P_{700}}$
C. ${P_{678}}$
D. ${P_{720}}$

Answer 1

Hint: Photosystem is the name discovered before the Photosystem 2 reactions that occurred in the 700 nm. Photosystem 1 is the second type of Photosystem present in the photosynthesis reactions of the plants, algae and bacteria. For biosynthesis reactions plants need more energy to do so. And absorption of light during the reaction at 680 nm which is its reaction center molecule called as a ${P_{680}}$.

Complete answer:
Inorganic compounds converted into the organic fuels with the help of stored potential energy in the carbon bonds during the photosynthesis. Cellular respiration and photosynthesis is the complementary process but not the opposite reaction during the metabolic processes.
Pigments are the molecules that absorb the wavelength and are colored. Biological pigments are produced by living organisms including plants pigments and flower pigments have a color resulting from selective color absorption. There are heme such as chlorophyll, hemoglobin, myoglobin luciferin, phytochromes, and canthaxanthin biological name of the present pigments. The principal pigments present in the plants such as chlorophyll, betalains, xanthophyll, carotenoid. The pigments help in the photosynthesis in the plants. Chlorophyll is the primary pigment and absorbed the yellow and blue wavelength and all lands plants have two types of chlorophyll present in it such as chlorophyll a and chlorophyll b but in some photosynthetic heterokonts and kelps chlorophyll c is present.

Therefore the correct option is (A).

Note: The color of the photosynthesis pigments are red blue and green during the P680 molecule reaction. Only specific energy level electrons in the molecules can exist and probably exist at the lowest possible energy level. But at the higher energy it is unable to absorb the wavelength. Because extra energy is converted into molecular motion and the result is lost as heat energy. This process is also known as fluorescence.