Different materials in each cup affect seed growth by changing how much water, air, and nutrients the seed receives. How some materials can affect it:Soil – Best for seed growth. It holds water, has nutrients, and allows air to pass through.Sand – Drains water too quickly. Seeds may not get enough moisture.Cotton – Holds water well but lacks nutrients. Seeds may sprout but not grow strong.Gravel or rocks – Poor for seed growth. No water retention or nutrients.Paper – Can hold water, but may break down fast and has no nutrients.Seeds grow best in materials that hold water well and have nutrients, like soil. Materials that are too dry or lack nutrients can slow down or stop growth.