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a) The opening and closing of stomata are controlled by the guard cells. When water flows into the guard cells, they swell up and the curved surface causes the stomata to open. When the guard cells lose water, they shrink and become flaccid and straight thus closing the stomata.
b) We conclude that wooden block and iron rod do not get compressed. 2. Solids have a definite shape and a definite volume. ... The particles in solids are very close to each other.
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