__ are two theories about the opening and closing of stomata.

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Solution

Sugar concentration theory and $K^{+}$ ion concentration theory are two theories about the opening and closing of stomata.

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Similar questions

What are stomata? Explain the functions and the opening and closing of stomata? [3 MARKS]

(A) Scotoactive stomata	(i) Opening and closing of photoactive stomata
(B) Guttation	(ii) Transpiration
(C)Tensile strength	(iii) Water loss in liquid phase
(D) K $^{+}$ pump theory	(iv) Night transpiration

Match the above columns and choose the correct combination.

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