Concept:Osmosis requires living cells with selectively permeable cell membranes. Heat treatment such as boiling or roasting destroys these membranes.
Explanation:In boiled or roasted yam, the cells are dead and their membranes no longer function as selectively permeable barriers.
As a result, osmosis cannot occur in these tissues.
Unpeeled yam has a protective outer covering that prevents direct contact between the living cells and the surrounding water or solution.
Peeled raw yam, however, has living cells whose membranes are fully exposed and functional.
When this tissue is placed in a solution, water can move across the cell membranes by osmosis.
Therefore, osmosis will take place only in raw and peeled yam tissue.
Answer:B. Raw and peeled