Question

In blue- green algae, photosystem-II contains important pigment concerned with photolysis of water. It is
A Phycocyanin
B Cytochrome-c
C Chlorophyll-b
D β-carotene

Answer 1

Hint: In order for you to arrive at an answer, try to understand and guess the function of each of the chemical substances mentioned below. By doing so, you will be able to arrive at an answer.

Complete answer:
- To arrive at the correct answer, we must first know the true definition of the photolysis of water and what type of an organism is blue-green algae.
- Photolysis of water is the process by which breakdown of water molecules occurs in the presence of sunlight during the process of photosynthesis.
- Blue-green algae also known as cyanobacteria are a group of prokaryotes consisting of free-living photosynthetic bacteria and endosymbiotic plasmids. Cytochrome-c is a hemoprotein that is found in association with the mitochondria. They play a very important role in apoptosis.
- Chlorophyll-b on the other hand is one of the three types of chlorophyll found in organisms. Chlorophyll-b helps in the absorption of light energy. It is green in color and absorbs blue light.β-carotene is an important orange-red pigment found in plants and certain fruits. It gives them a rich orange color.β-carotene has rich antioxidant properties and it can be converted to vitamin A inside the body. Phycocyanin is a group of pigments found in cyanobacteria and helps in the photolysis of water.

Thus the correct option is (A) Phycocyanin.

Note:- Phycocyanin belongs to the light-harvesting phycobiliprotein family. Phycobiliproteins are water-soluble and they are not capable of being present in the membranes. These proteins form clusters and are found adhered to the membranes and are now as phycobilisomes.