Gaseous Exchange in Plants (5)

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Parts of a mangrove plant where gaseous exchange occurs (3)

Aerial roots (lenticels)

Turgid and curved guard cell

Flaccid and straight guard cell

Effects of osmosis on stoma (1)

During the day, water diffuses into the guard cells through osmosis and causes both the guard cells to curve and open the stoma

Effects of osmosis on stoma (2)

At night or on a hot day, water diffuses out of the guard cells through osmosis and causes both the guard cells to become straight

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