GENERAL KNOWLEDGE

Detailed explanation-1: -Through a process called photosynthesis, leaves pull in carbon dioxide and water and use the energy of the sun to convert this into chemical compounds such as sugars that feed the tree. But as a by-product of that chemical reaction oxygen is produced and released by the tree.

Detailed explanation-2: -Although many land plants get some of their oxygen from water that rises from the soil through conducting tissues (the water-conducting tissue is called xylem, which forms the wood in trees), water doesn’t supply enough-plants also need to take in oxygen from the air.