In the vast marine ecosystem, certain sea develop red colouration. This red colour is due to the presence of large population of which one of the following organisms?
Trichodesmium erythrium
Physarium
Dinoflagellates
Diatoms and members of red algae
Maximum absorption of rainfall water is done by
Treeless biome of cold climates is
The ultimate energy source of ecosystem is
Which one of the following is no used for construction of ecological pyramids?