The structure labeled II is the sporangium. A sporangium is a structure found in plants, fungi, and some bacteria that produces and contains spores. In plants, the sporangium is commonly found in the reproductive organs of the plant, such as the flowers, and is responsible for producing spores that will eventually become the seeds of the plant. In fungi, the sporangium is found at the end of specialized hyphae and is responsible for producing spores that will give rise to new fungal organisms. Sporangia can take on many different shapes and sizes depending on the organism, but they all serve the same basic purpose of producing and containing spores. Therefore, based on the given options, the correct answer is sporangium.
