Which process limits CO2 absorption in C4 plants after prolonged drought stress?

💡 Explanation

Under drought stress, stomatal closure minimizes water loss, which inevitably decreases intercellular CO2 concentration because diffusion gradient is reduced, thereby limiting CO2 availibilty for carboxylation in mesophyll cells. Therefore limited intercellular CO2 reduces absorption, rather than increased resistance, rubisco inactivation or sheath depletion which affect internal photosynthetic process directly.

• Which outcome routinely occurs in ungulates lacking diverse gut microbiomes during periods of vegetation scarcity?
• Which outcome results when prolonged exposure to acidic ocean water inhibits coral calcification?
• Which outcome occurs when arctic foxes enter torpor?
• Which risk increases for birds during long-distance migration when air sac oxygen levels become insufficient?
• Which effect follows activation of membrane ion channels by snake venom?
• Which outcome occurs when a fish inefficiently adjusts internal swim buoyancy?