Answer:
Carbon dioxide is critical to the initiation of the light independent
reactions occurring in the stroma.
Explanation:
Carbondioxide is a raw material which is used as a reactant in the process of photosynthesis. In photosynthesis process, carbondioxide enters into the leaves through a small opening called stomata. From there, it goes to the stroma which is essential part of chloroplast. This carbondioxide is necessary for the initiation of light independent reaction of photosynthesis.