Question

Assertion : Deforestation enhanced carbon dioxide concentration in the atmosphere.
Reason : Trees hold a lot of carbon in their biomass.

• A. Assertion and reason are true and the reason is the correct explanation of the assertion
• B. Assertion and reason are true but the reason is not the correct explanation of the assertion
• C. Assertion is true but the reason is false
• D. Both assertion and reason are false

Answer 1

The correct option is A Assertion and reason are true and the reason is the correct explanation of the assertion

Plants or trees play an important role in balancing the ecosystem and the environment. They take in carbon dioxide and release oxygen during photosynthesis. This process of photosynthesis explains forests are $C{O}_2$ sinks.

They remove $C{O}_2$ from the atmosphere by fixing atmospheric $C{O}_2$ in the chlorophyll and convert it into complex organic molecules (starch). Therefore, they are important carbon pools that continuously exchange $C{O}_2$ with the atmosphere.

Carbon stored in the living plant biomass consists of wood, leaves, fruits etc. The amount of carbon in the biomass varies between 35 to 65% of the dry weight. At the global level, 19% of carbon in the Earth's biosphere is stored in plants and 81% is stored in the soil.

Therefore, assertion and reason are true and the reason is the correct explanation of the assertion.