Question

Oxygen is a gas produced by _____ and used by _______
A. Plants, animals
B. Animals, plants
C. Photosynthesis, carbon dioxide
D. Carbon dioxide, photosynthesis

Answer 1

Hint: Oxygen is a gas. That is abundant in the environment. It is combustible gas. It is necessary. For humans to survive as we cannot survive without breathing and oxygen is our source of breathing. This gas is involved during the process of photosynthesis.

Complete answer: Oxygen is a colourless gas or compound. It is very reactive in the element form. It is also known as O2. The 70% of human body mass consists of oxygen.
 Formation of oxygen - Oxygen formed with the process of photosynthesis. Photosynthesis is a process in which plants? Prepare their food with the help of sunlight; they consume carbon dioxide in this process and release oxygen. All the plants follow this process when they have sunlight. plants release oxygen during the process of photosynthesis in order to release the waste material. They used this release of oxygen during night time when the process of photosynthesis is not going on.
Process of photosynthesis in simple words is known as plants use sunlight to make their own food. the process of photosynthesis in plants because plants leaves have chlorophyll that helps plants in formation of the food. As all the living organisms need oxygen to survive. Only plants such living organisms that release oxygen, especially in the process of photosynthesis. So animals use oxygen in order to breathe.

So, from the above discussion we can conclude that the correct answer is option A.

Note:
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.