Final answer:
The important gas for photosynthesis is carbon dioxide, as it is used with water and light energy to produce glucose and oxygen.
Step-by-step explanation:
The gas important to photosynthesis is carbon dioxide (d). Photosynthesis is a vital biological process through which plants, algae, and some bacteria convert carbon dioxide and water into glucose and oxygen using the energy from sunlight. In this process, the chlorophyll found in plant cells absorbs energy from light, primarily sunlight, and uses it to transform carbon dioxide (from the atmosphere) and water (from the soil) into sugars or carbohydrates. These sugars are used by the plants as a source of energy for growth and development.
The general equation representing the photosynthesis process is as follows:
6CO₂(g) + 6H₂O(l) → C₆H₁₂O₆(s) + 6O₂(g)
Carbon dioxide, water, and light are the reactants, and glucose (sugar) and oxygen are the primary products. Therefore, carbon dioxide is critical to the photosynthesis process, making option (d) the correct answer to the question.