What is the primary function of a bulb in a plant?

The primary function of a bulb in a plant is to store nutrients for future growth. Bulbs are specialized underground storage organs that contain all the necessary nutrients and energy reserves that a plant needs to survive adverse conditions, such as winter or drought. This stored energy helps the bulb to produce new leaves and flowers when conditions become favorable again.

While bulbs may also play a role in reducing water loss by being underground, their main purpose is nutrient storage. They do not directly perform photosynthesis, as the green parts of the plant above ground accomplish that, and although bulbs can assist in anchoring the plant, their main role is not primarily for anchorage but rather for storing energy and nutrients crucial for the plant's survival and growth during non-growing seasons.