NEET BIOLOGY

Detailed explanation-1: -Red algae and blue-green algae contain phycobilins, which are water-soluble pigments (cyanobacteria). It’s found in the chloroplast’s stroma. Phycobilins can be divided into two categories. Phycoerythrin–these pigments are red in colour and are found in red algae.

Detailed explanation-2: -Red algae are red because of the presence of the pigment phycoerythrin; this pigment reflects red light and absorbs blue light.

Detailed explanation-3: -It occurs throughout the red algae and in some cyanobacteria. Phycocyanin (phycocyanobilin plus protein) appears bluish because it absorbs strongly from 610 nm to 660 nm (Fig. 5-8). It is the main phycobilin in the cyanobacteria and also is found in the red algae.

Detailed explanation-4: -Phycobilins are found in red algae and cryptomonads. They are also found in cyanobacteria. Inside the cells of these organisms, the phycobilins collect light energy from the sun and pass this energy to the primary pigment, which is the chlorophyll.

Detailed explanation-5: -Phycoerythrobilin appears red, phycocyanobilin is blue, phycoviolobilin is purple, and phycourobilin is yellow colored.