i. To regulate gaseous (O2 and CO2) exchange, ii. To regulate water / transpiration / prevent water loss, Guard cell, Stoma/ Stomata/ Stomatal opening, Chloroplast, To trap light energy for photosynthesis , i. Starch-Sugar Hypothesis, ii. Potassium Ion Hypothesis, Opens, Closes.

FIGURE 2 shows structures found on leaves ( regulation opening and closing of the stomatal)

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