How do hot, dry conditions lead to decreased concentrations of CO2 in the leaf and cause photorespiration to occur? Multiple choice question. Stomata stay open, causing the plant to lose water and gain oxygen. Stomata close, trapping oxygen in the leaf and preventing carbon dioxide from entering. Stomata close, trapping carbon dioxide in the leaf and preventing oxygen from entering. Stomata stay open, causing the plant to lose water and gain carbon dioxide.