During the day, when the light required for photosynthesis is available, the plant doesn’t need to open its pores: it has a packed lunch already stored in its cells.
Wakati wa mchana, wakati mwanga unaohitajika kwa photosynthesis unapatikana, mmea hauhitaji kufungua pores zake: ina chakula cha mchana kilichojaa tayari kilichohifadhiwa kwenye seli zake.