Oxygen Cycle
Oxygen Cycle
Concentration of oxygen in air: The concentration of oxygen in the atmosphere is about 21%. It is one of the constituents of water. Oxygen is cycled in the living world through respiration and photosynthesis. All living organisms take in oxygen for respiration. During this process food is oxidized, energy is produced and carbon dioxide is released into the atmosphere. Carbon dioxide is used by green plants to produce food materials during photosynthesis. Oxygen is released in this process as a by-product. Some of the oxygen also gets incorporated into the food materials.
Oxygen cycle: Oxygen is also cycled during burning and combustion. Oxygen is consumed in the burning of materials and carbon dioxide is released during this process. Oxygen combines with nitrogen and forms nitrogen oxides, amino acids, proteins, etc. These compounds release oxygen in the atmosphere when they are broken down. Thus, the oxygen level is balanced in the environment.
Which of the following are correct : (a) Oxygen gets removed from the air during respiration and burning. (b) The balance of oxygen and carbon dioxide in the atmosphere is maintained through respiration in plants and animals and by photosynthesis in plants. | |||
| Right Option : C | |||
| View Explanation | |||
Oxygen is ______________ during the process of combustion. | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following statements about oxygen gas is not true? | |||
| Right Option : D | |||
| View Explanation | |||
Students / Parents Reviews [10]
About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
7thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
