Answer:
Cellular respiration would be likely to slow due to decreasing O2
Step-by-step explanation:
One of the essential factors for germination to proceed is the presence of oxygen. The embryo within the seed needs to respire to get the much needed energy to drive the various metabolic activities that eventually leads to the emergence of the embryo from the seed coat (germination).
During respiration, the energy locked up in foods is released in a multiple-steps reaction whose summary goes thus;

Hence, if germinating seeds are placed in an airtight container, the much needed oxygen for respiration will be limited, resulting in the slowing down of cellular respiration due to inadequate oxygen. If the condition persists much longer, cellular respiration will cease completely and the seeds will die off.