no
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Although the cell wall is tough, many materials, including water and oxygen, can pass through easily.
if we add some sulphuric acid or NaOH and then pass electricity through the water, then electrolysis of water takes place and hydrogen and oxygen gases are formed.
impermeable
Opaque is antonym for transparent. Transparency allows light to pass through. Glass, water are examples. If light is not allowed to pass through then such a substance is termed as opaque.
Almost all bodies of water allow people to pass through from one side to the other. You can cross a river, sea, or canal via boat.