Question

When trees are cut, the amount of oxygen:
A.Decreases
B.Increases
C.Both (A) and (B)
D.Remains same

Answer 1

Hint: This question is based on the general environmental and scientific concept of the role of trees in the environmental ecosystem. Trees play a very important role when it comes to the well-being of our surroundings and the Earth’s natural ecosystem. Trees are a very important asset of our environment.

Complete answer:
Trees take in oxygen and release carbon dioxide in the process of photosynthesis. Photosynthesis is the conversion of light energy into chemical energy by phototrophs, which is then used to power cellular processes. Sugars, which are made from water and carbon dioxide, are used to store chemical energy.
Carbon dioxide and water are the two reactants in the photosynthesis reaction. Two products are produced by these two reactants: oxygen and glucose. As a result, photosynthesis is classified as an endothermic reaction.
Photosynthesis is a process in which cells employ carbon dioxide and solar energy to create sugar molecules and oxygen. These sugar molecules serve as the building blocks for the photosynthetic cell's more complex compounds, such as glucose.
Photosynthesis produces and maintains the oxygen concentration of the Earth's atmosphere, as well as providing the majority of the energy required for life on the planet.
Thus, trees maintain the necessary level of oxygen in the environment and improve the quality of air for all life that is dependent on oxygen. When trees are cut, the amount of oxygen decreases.
Thus (A) is the correct option.

Note:
Marine plants and plant-like creatures provide about $70\%$ of the oxygen in the atmosphere. As a waste product of photosynthesis, these ocean-dwelling plants release molecular oxygen (as do most plants).