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  • Brainly User
2015-06-09T13:09:27+05:30

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Because their opening and closing is determined by their turgidity.The stomata  acts as a turgor operated valve which closes and opens according to the turgidity of guard cells. The guard cells are the only epidermal cells that contain chloroplasts
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  • Brainly User
2015-06-10T14:52:13+05:30
Each stomata consists of a minute pore called stoma surrounded by two guard cells. The stomata acts as a turgor operated valve .it closes and opens according to the turgidity of guard cells.
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