Among the ecosystem mentioned below, where can one find maximum biodiversity?

Answer: CSolution: Coral reefs are the most productive ecosystem (2000-6000 kcal/$m^2$/y) and form the most diverse part of costal region providing a home to fish mollusces, crustaceans sponges, cnidarians, etc.
Mangroves, found in coastal regions usually have plants growing in swampy and saline water, deserts have mostly xerophytic species and Alpine meadows are related to high altitudes and do not show much tree growth.