Question

A beet root slice is first washed and then placed in cold water and it does not lose its anthocyanin. This shows that plasma membrane becomes

• A. Impermeable to anthocyanin
• B. Permeable to anthocyanin
• C. Deferentially permeable to anthocyanin
• D. Dead

Answer 1

The correct option is A Impermeable to anthocyanin

Anthocyanin is a water soluble pigment. Plasma membrane is made up of lipids and proteins. It is generally permeable for lipophilic or lipid soluble compounds and does not allows free passage of water soluble or hydrophilic compounds. Hence, anthocyanin pigment cannot pass through the cell membrane. However, if the membrane is damaged by chemicals or other treatment like boiling etc. anthocyanin will readily flow out of cells.

So, the correct answer is 'Impermeable to anthocyanin'.