Choanocyte Surface 1249A6

1. The problem asks: Which body plan has the least choanocyte-bearing surface area? 2. Choanocytes are specialized cells in sponges that line the internal chambers and are responsible for water flow and feeding. 3. There are three main sponge body plans: Asconoid, Syconoid, and Leuconoid. 4. The choanocyte-bearing surface area increases from Asconoid to Syconoid to Leuconoid. 5. The Asconoid body plan has the simplest structure with a single large central cavity lined with choanocytes, so it has the least choanocyte-bearing surface area. 6. Syconoid has folded walls increasing surface area, and Leuconoid has a complex system of chambers greatly increasing choanocyte surface area. 7. The option "The plan with six-rayed spicules" refers to skeletal features, not directly related to choanocyte surface area. 8. Therefore, the answer is the Asconoid body plan, which has the least choanocyte-bearing surface area.