AP BIOLOGY

Detailed explanation-1: -Oxygen is a very essential gas on the earth atmosphere and is necessary for every living organism to survive. Oxygen is released by plants during the process of photosynthesis. And oxygen is used by animals or humans for survival so we can say that Oxygen gas is produced by plants and used by animals.

Detailed explanation-2: -The leftovers from making the plant food is another gas called oxygen. This oxygen is released from the leaves into the air. Take a look at the picture below to see this system in action. This leftover oxygen is really important because humans and other animals need this oxygen to live which we breathe in from the air.

Detailed explanation-3: -The byproduct of photosynthesis is oxygen. The oxygen can be used in cellular respiration or removed from the organism.

Detailed explanation-4: -Oxygen is given off by green plants in the process of photosynthesis. Green plants are the lungs of the earth! All animals inhale oxygen and exhale carbon dioxide. Plants take in carbon dioxide and give off oxygen as they make food.

Detailed explanation-5: -Chlorophyll (green pigment of the leaf), light, and CO2 are required for photosynthesis to occur. The end products of photosynthesis are-carbohydrates (mainly glucose) and oxygen (O2) gas. Oxygen gas is released during photosynthesis.