Chlorophyll a is present in all photosynthetic plants, algae, and cyanobacteria, while only plants and green algae contain chlorophyll b, along with a few types of cyanobacteria. From the visible spectrum, red light has the longest wavelength and the least energy, while violet light has the shortest wavelength and the most energy.

So, the correct answer is option d) All of these.Ībsorption spectrum of the substances is measured using a spectrophotometer. They also dispose of the excess energy out of the cell. $eta -carotene$ and other carotenoids absorb light in the blue-green and violet region and reflect the longer yellow, red, and orange wavelengths. The pigments are often named after the wavelength which is maximally absorbed by them, for example, $)$, etc. For example, plants appear green to us because they contain chlorophyll a and b pigments, which reflect green light. The wavelengths that pigment doesn't absorb are reflected, and the reflected light is what we see as the color of the plant. The more light absorbed, the higher is the rate of photosynthesis. Chlorophyll molecules absorb blue and red wavelengths, as shown by the peaks in the absorption spectra in the figure above. The graphical curve in the figure showing the amount of energy of different wavelengths of light absorbed by a pigment is called the absorption spectrum. The graphs below show the variation in absorbance intensity with concentration. In photosynthesis, the sun’s light energy is converted to chemical energy by the photosynthetic pigments present in the organism. In absorbance spectroscopy (also known as absorption spectroscopy).

An absorption spectrum will show a number of absorption bands corresponding to structural groups. The pigments also perform most efficiently at a particular wavelength, which is reflected in the graph. Different molecules absorb radiation of different wavelengths. Hint: The photosynthetic pigments of a plant do not utilize the sunlight as a whole but pick up specific wavelengths of light to convert it into chemical energy.

Absorption spectra graph