Final answer:
The amount of sunlight is the least important factor in determining plant life in a biome.
Step-by-step explanation:
The abiotic factors such as temperature, moisture, sunlight, and soil quality are important influences on plant growth and the type of plants that can thrive in a biome. Among these factors, the least important in determining plant life in a biome would be the amount of sunlight. While sunlight is essential for photosynthesis, it is not the primary determining factor for the types of plants that can grow in a biome. Other factors such as temperature, moisture, and soil quality have a greater impact on the suitability of a habitat for certain plant species.