Explaining why osmosis is important in Animal and Plant cells.

Homework piece for B4- Processes of Life. Triple Science, OCR 21st Century. 2011 specification. Received B/A Grade. Hope it helps. 

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Explain why osmosis is important in
Animal cells and Plant cells.(6)
When plant cells are placed in a solution weaker than their
own, the plant cells become turgid and the plant is upright.
This is because water enters the (higher concentrated
solution) the Vacuole by Osmosis. The Vacuole then expands
inside the cell until it reaches the size of the partially
permeable cell membrane, which is able to resist expansion
and will not explode (plant cells are able to resist expansion).
When plant cells are placed in a solution stronger than their
own, they become floppy and wither. This is caused by osmosis
when water leaves the cell, the cell then shrinks.
Animal cells need to have the same concentration inside as
the solution surrounding them. Otherwise, when placed in a
stronger solution, they would shrivel up because too much
water would leave the cell, by osmosis, to balance the
solutions. When animal cells are placed in weaker solutions,
too many water molecules would enter the cell because they
would have a stronger solution. The cells would expand too
much and explode.

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