AP BIOLOGY

Detailed explanation-1: -Explanation: Tanninsare carbon compounds . These are stored in different parts of a plant of a plant and are deep brown in colour. Tannins are used in tanning of leather and in medicines e.g. cassia, acacia.

Detailed explanation-2: -The water in the soil becomes rich with tannins and seeps into the ground water or drains into lakes and streams. These waters become brown in color and look like tea.

Detailed explanation-3: -Tannic acid is brown in color, so in general white woods have a low tannin content. Woods with a lot of yellow, red, or brown coloration to them (like cedar, redwood, red oak, etc.) tend to contain a lot of tannin.

Detailed explanation-4: -Characteristic examples of hydrolysable tannins are (1) gallic acid; (2) hexahydroxydiphenic acid; (3) ellagic acid; and (4) pentagalloylglucose, which contain a central glucose molecule as the core attached with multiple gallic acid units, while ellagitannins are associated to hexahydroxydiphenic acid.

Detailed explanation-5: -Polyhydroxy phenolic compounds which convert animal hide to leather by precipitating proteins and give positive Gold beater’s skin test, are called true tannins.