Question

question 3 of 10
what is predicted to happen if the permafrost in the arctic melts?
a. bacteria will be unable to carry out their role as decomposers.
b. the decomposition of plants will release enormous amounts of co₂.
c. plants will absorb enormous amounts of co₂.
d. dead plants will be unable to decompose.

Explanation:

Permafrost in the Arctic contains large amounts of dead plant material. When permafrost melts, the temperature rises. This allows bacteria (which are decomposers) to become more active. As bacteria decompose the dead plants, they release carbon - dioxide ($CO_2$).

• Option A: When permafrost melts, bacteria can be more active as decomposers (not less), so this option is incorrect.
• Option C: The key process here is decomposition (release of $CO_2$) due to melting permafrost, not plants absorbing $CO_2$. So this option is incorrect.
• Option D: Melting permafrost allows for decomposition (not prevents it), so this option is incorrect.

Answer:

B. The decomposition of plants will release enormous amounts of $CO_2$.