Oxygen Cycle -Multiple Choice Questions Quiz

Interactive MCQs on “Oxygen Cycle”:

Solve the following 10 questions. Only one option is correct. Click on the “Submit” button when done. Click on the “embed” button to use this quiz on your website. Click on “WhatsApp” to share this quiz.

Question 1: What is the oxygen cycle?

(a) The process of converting oxygen into carbon dioxide
(b) The continuous movement of oxygen through the Earth's atmosphere, biosphere, and lithosphere
(c) The process of oxygen gas being released during photosynthesis
(d) The transformation of oxygen from a gas to a solid

Question 2: How is oxygen primarily replenished in the atmosphere?

(a) By volcanic activity
(b) By the respiration of plants
(c) By photosynthesis in plants
(d) By the decay of organic matter

Question 3: What is the primary role of oxygen in the atmosphere?

(a) It provides energy for living organisms
(b) It supports combustion and respiration
(c) It absorbs ultraviolet radiation
(d) It contributes to the greenhouse effect

Question 4: What is the primary source of oxygen that is released into the atmosphere?

(a) Volcanic emissions
(b) Ocean water
(c) Fossil fuels
(d) Photosynthesis by plants and phytoplankton

Question 5: What is the process by which oxygen is consumed and converted into carbon dioxide by living organisms?

(a) Respiration
(b) Photosynthesis
(c) Decomposition
(d) Combustion

Question 6: How is oxygen returned to the biosphere and lithosphere from the atmosphere?

(a) Through volcanic emissions
(b) Through respiration of animals
(c) Through combustion of fossil fuels
(d) Through weathering and erosion

Question 7: Which process contributes to the oxygen cycle by breaking down organic matter and releasing oxygen during decay?

(a) Photosynthesis
(b) Respiration
(c) Combustion
(d) Decomposition

Question 8: What is the role of oxygen in water bodies?

(a) It serves as a source of nutrients for aquatic plants
(b) It supports respiration in aquatic organisms
(c) It prevents the growth of algae
(d) It converts carbon dioxide into nitrogen gas

Question 9: What is an example of a natural process that releases oxygen into the atmosphere?

(a) Burning of fossil fuels
(b) Deforestation
(c) Eutrophication
(d) Photosynthesis by trees and algae

Question 10: How does the oxygen cycle contribute to maintaining the balance of gases in the Earth's atmosphere?

(a) It increases the concentration of carbon dioxide
(b) It decreases the concentration of nitrogen
(c) It stabilizes the concentration of oxygen and other gases
(d) It leads to the depletion of ozone