Photosynthesis & Oxygen Production (Daytime) Most trees and plants produce oxygen during the day through photosynthesis, which requires sunlight. They absorb carbon dioxide (CO) and release oxygen (O). What Happens at Night? Brown Spots on Weed Leaves What Are They? Complete Plant Based Foods List How to Plant, Grow, and Care for 'Black Magic' Colocasia Diorama I made with a pond from dollar tree and some butterfly and duck minis from Michaels. Of course i did repaint them and i added some resin to the pond