Question

Oxygen cycle is threatened by :

• A. plantation of trees
• B. deforestation
• C. photosynthesis
• D. respiration

Answer 1

The correct option is B

deforestation

1. Oxygen does not get depleted though it is constantly used up in during the burning of fuels,as it is constantly produced by the process of photosynthesis,by the plants.
2. Deforestation is a process of cutting down of the trees by the humans .
3. Therefore option b is the correct option,as deforestation will hinder the production of oxygen.
4. Whereas option a,c and d are involved in the oxygen cycle as plantation of trees,photosynthesis produce oxygen in the atmosphere,whereas respiration produce carbon dioxide which is used by plants .