Arrange the following ecosystems in increasing order of their mean NPP (tons/ha/year)
(A) Tropical deciduous forest
(B) Temperate coniferous forest
(C) Tropical rain forest
(D) Temperate deciduous forest
B < D < A < C
Tropical rain forest shows the maximum diversity and maximum productivity. It is followed by deciduous forests, temperate forests, savannah, temperate grasslands and desert scrub.