Question

Where in the organelle are CO₂ and H₂O stored before they are used in photosynthesis?

Answer 1

Carbon dioxide in plants is stored in the stroma of chloroplasts after entering through the stomata, whereas water is transported via the plant's vascular system. Both CO₂ and H₂O are then used in the chloroplast during the light-independent reactions of photosynthesis to produce glucose.

Step-by-step explanation:

In plants, carbon dioxide (CO₂) enters through the stomata and makes its way to the mesophyll cells, where it eventually diffuses into the chloroplast. Within the chloroplast, CO₂ is temporarily stored in the stroma, the fluid-filled interior space that surrounds the thylakoids. The stroma is the site where the light-independent reactions or Calvin cycle of photosynthesis occur, and carbon dioxide is used to produce glucose. On the other hand, water (H₂O) is absorbed through the roots and transported to the chloroplasts via the vascular system of the plant.

The detailed process of photosynthesis involves two main stages: the light-dependent reactions and the light-independent reactions. During the light-dependent reactions, which take place in the thylakoid membranes, light energy is captured and converted into chemical energy as ATP and NADPH. These energy-carrying molecules are then used in the stroma during the light-independent reactions to fix carbon dioxide and convert it into glucose.

Answer 2

Final Answer:

Before being used in photosynthesis, CO₂ and H₂O are stored in the stroma of the chloroplast. The stroma is the fluid-filled matrix surrounding the thylakoid membrane. In this compartment, CO₂ and H₂O undergo the reactions of the Calvin cycle, a part of photosynthesis that leads to the synthesis of glucose and other organic molecules.

Step-by-step explanation:

The final answer provides additional information by explaining the role of the stroma in the chloroplast. It mentions that the stroma is where the Calvin cycle occurs, a crucial phase of photosynthesis involving the conversion of CO₂ and H₂O into organic molecules.