Question

Agar-agar, Carrageenin and Funori are obtained from
A. Cell wall of red algae
B. Cell wall of brown algae
C. Gmcigafia and Gelidium
D. Cell wall of green algae

Answer 1

A number of Phycocolloids are extracted for commercial use. These include agar, carrageenan and funori. Agar is employed in solidifying culture media and is added as stabiliser or thickener within the preparation of jellies. Puddings, creams, cheese, bakery, etc. Agar is obtained from Gelidium, Gracilaria and Gigartina. Carrageenan is employed as a clearing agent in liquors, leather finishing and as an emulsifier in chocolates, ice creams, toothpaste, paints, etc. It's extracted from Chondrus crispus. Funori may be a glue used as adhesive and in sizing textiles, paper, etc.

Complete Answer:
Currently various styles of marine algae, like Phaeophyceae and Rhodophyceae, are highly valuable sure enough commercial products, most significantly algin or gum, agar-agar, and carrageenan.

Red algae are defined as eukaryotic algae which possess chlorophyll, phycobilins, floridean starch as food reserve, abundant phycocolloids (like agar, carrageenin, and funori) but lack flagellate cells. They're an ancient group of algae which are marine apart from some species.

Agar-agar is obtained from various species of algae, for instance, Gracilaria lichenoides, Gelidium corneum, G. cartilageneum, and species of Furcellaria, Chondrus, Gigartina, Pterocladia, Phyllophora, Ahnfeltia, and Gampylaephora. Agar-agar could be a non-nitrogenous extract, which is obtained almost during a pure mucilaginous form. A carbohydrate galactan is that the chief constituent of agar. So, the algae are picked, decolorized, and also the mucilaginous matter is extracted with water. The cleaned agar is sold within the sort of granules, flakes or strips, which are brittle when dry but become resistant and difficult when moist.

The use of agar-agar is extremely important in microbiology and tissue culture. Other uses are in paper and silk industries, in cosmetics, in canning fish, in dentistry for creating impressions, in sizing material, to forestall soft fish from being shaken to pieces during transit, in clarifying liquors, etc. It may be used as food and within the preparations of jellies, ice-cream, food, and sweets.

Carrageenan it's a metabolic product very like agar, which is obtained from Gigartina stellata, carrageen, and Iridaea laminaroides. As for the mucilage, it's several important industrial applications. As an example, it's utilized in the textile industry additionally as in paper-making to relinquish body to the paper. It's also employed in the manufacture of straw and felt hats as a stiffening agent. It are often used as an ingredient in cosmetics, hand lotions, shoe-polishes, tooth paste, etc. It's widely utilized in baking, as an emulsifying and suspending agent and in clarifying of liquors and dairy industries.

Funori is analogous to agar obtained from Gloiopeltis furcata and species of Ahnfeltia, Chondrus, Grateloupia, and Iridaea. It's mostly used as glue and as a sizing agent.

Therefore, the correct option is A, a cell wall of red algae.

Note: The alaria is used for strengthening the stomach and restoring appetite after sickness. As for the alginates, they're useful for his or her haemostatic nature. Fucoidan and sodium lamanarin sulphate are used because of the “blood anticoagulant”. A Rhodophycean alga, digenea simplex, provides an antihelminthic remedy. Agar-agar is employed for its absorptive and lubricating component. It's also used medicinally to forestall constipation. The antibacterial product chlorellin, which is obtained from Chlorella is well-known nowadays. Its antibacterial effects are more against coliforms and few intestinal bacteria.