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In the process of photosynthesis, which pigment is primarily responsible for the absorption of light energy in the blue and red regions of the spectrum?
Chlorophyll a
Carotenoids
Anthocyanin
Phycobilins
Chlorophyll a
Chlorophyll a is the primary photosynthetic pigment in plants, algae, and cyanobacteria, which is primarily responsible for the absorption of light energy in the violet-blue and red regions of the visible light spectrum. It acts as the major electron donor in the electron transport chain of the photosystems during light reactions.
Chlorophyll a is the primary photosynthetic pigment in plants, algae, and cyanobacteria, which is primarily responsible for the absorption of light energy in the violet-blue and red regions of the visible light spectrum. It acts as the major electron donor in the electron transport chain of the photosystems during light reactions.
Think of chlorophyll a as the main solar panel receiver tuned specifically to absorb the most energetic and optimal wavelengths of sunlight, while accessory pigments act like backup panels that catch leftover colors.
Blue and Red are Best for Chlorophyll a
6CO_2 + 6H_2O \xrightarrow{\text{Light} \, & \, \text{Chlorophyll}} C_6H_{12}O_6 + 6O_2 тАФ Overall equation for oxygenic photosynthesis
When chlorophyll a molecules absorb photons of light in the blue (approx. 430 nm) and red (approx. 660 nm) wavelengths, their electrons are excited to a higher energy level. This absorbed light energy is converted into chemical energy through photochemical charge separation in the reaction center chlorophylls (P680 in Photosystem II and P700 in Photosystem I).
Chlorophyll a is the essential pigment found in all oxygenic photosynthetic organisms.
It strongly absorbs light in the blue-violet and red wavelengths while reflecting green light, which gives plants their characteristic color.
Accessory pigments like chlorophyll b and carotenoids absorb light in different wavelengths and transfer energy to chlorophyll a.
Efficiently converts solar energy into chemical energy (ATP and NADPH).
Does not absorb green light efficiently, leading to reflection and transmission of green wavelengths.
Primary driver of global primary production and oxygen generation in terrestrial and aquatic ecosystems.
Chlorophyll a contains a porphyrin ring with a magnesium ion at its center and a long hydrocarbon tail.
Option B (Carotenoids) are accessory pigments absorbing blue-green light. Option C (Anthocyanin) is a water-soluble vacuolar pigment responsible for red/purple/blue colors. Option D (Phycobilins) are light-harvesting pigments found in cyanobacteria and red algae.
A is correct тАФ Chlorophyll a is the principal pigment responsible for light absorption in the blue and red regions of the spectrum during photosynthesis.
In competitive exams like RRB JE, remember that chlorophyll a is the primary reaction center pigment, whereas chlorophyll b and carotenoids are accessory pigments that broaden the light absorption spectrum.
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